[SPARK-10556] Remove explicit Scala version for sbt project build files
[SPARK-10556] Remove explicit Scala version for sbt project build files

Previously, project/plugins.sbt explicitly set scalaVersion to 2.10.4. This can cause issues when using a version of sbt that is compiled against a different version of Scala (for example sbt 0.13.9 uses 2.10.5). Removing this explicit setting will cause build files to be compiled and run against the same version of Scala that sbt is compiled against.

Note that this only applies to the project build files (items in project/), it is distinct from the version of Scala we target for the actual spark compilation.

Author: Ahir Reddy <ahirreddy@gmail.com>

Closes #8709 from ahirreddy/sbt-scala-version-fix.

Panos-Bletsos/spark-cost-model-optimizer,aray/spark,ueshin/apache-spark,huang1900/spark,srowen/spark,HyukjinKwon/spark,goldmedal/spark,rednaxelafx/apache-spark,stanzhai/spark,bdrillard/spark,sureshthalamati/spark,ajaysaini725/spark,jiangxb1987/spark,zero323/spark,maropu/spark,publicRoman/spark,SHASHANKB/spark,loneknightpy/spark,actuaryzhang/spark,goldmedal/spark,apache-spark-on-k8s/spark,haowu80s/spark,ahnqirage/spark,mike0sv/spark,dbtsai/spark,mike0sv/spark,akopich/spark,Panos-Bletsos/spark-cost-model-optimizer,milliman/spark,lvdongr/spark,minixalpha/spark,goldmedal/spark,xuanyuanking/spark,sahilTakiar/spark,debugger87/spark,jkbradley/spark,jianran/spark,kimoonkim/spark,liyichao/spark,michalsenkyr/spark,WeichenXu123/spark,panfengfeng/spark,apache/spark,chuckchen/spark,zuotingbing/spark,rikima/spark,ericvandenbergfb/spark,liutang123/spark,shubhamchopra/spark,icexelloss/spark,taroplus/spark,apache/spark,maropu/spark,ptkool/spark,wangyum/spark,spark-test/spark,liutang123/spark,rikima/spark,brad-kaiser/spark,jkbradley/spark,goldmedal/spark,ueshin/apache-spark,eyalfa/spark,big-pegasus/spark,byakuinss/spark,apache-spark-on-k8s/spark,taroplus/spark,dbtsai/spark,stanzhai/spark,jianran/spark,zzcclp/spark,someorz/spark,esi-mineset/spark,markhamstra/spark,shubhamchopra/spark,rikima/spark,saturday-shi/spark,lxsmnv/spark,joseph-torres/spark,poffuomo/spark,spark-test/spark,Aegeaner/spark,zuotingbing/spark,vinodkc/spark,1haodian/spark,actuaryzhang/spark,bdrillard/spark,saltstar/spark,someorz/spark,pronix/spark,nlalevee/spark,mahak/spark,kevinyu98/spark,metamx/spark,adrian-ionescu/apache-spark,UndeadBaneGitHub/spark,kiszk/spark,brad-kaiser/spark,mzl9039/spark,ron8hu/spark,nlalevee/spark,patrick-nicholson/spark,sahilTakiar/spark,bravo-zhang/spark,ueshin/apache-spark,shubhamchopra/spark,xflin/spark,haowu80s/spark,UndeadBaneGitHub/spark,tengpeng/spark,zuotingbing/spark,tejasapatil/spark,kevinyu98/spark,setjet/spark,cin/spark,hvanhovell/spark,SHASHANKB/spark,patrick-nicholson/spark,xuanyuanking/spark,jkbradley/spark,andrewor14/spark,ddna1021/spark,skonto/spark,bOOm-X/spark,ioana-delaney/spark,ajaysaini725/spark,SHASHANKB/spark,minixalpha/spark,setjet/spark,witgo/spark,JerryLead/spark,narahari92/spark,skonto/spark,sureshthalamati/spark,spark-test/spark,shuangshuangwang/spark,kiszk/spark,techaddict/spark,ConeyLiu/spark,holdenk/spark,loneknightpy/spark,guoxiaolongzte/spark,HyukjinKwon/spark,minixalpha/spark,poffuomo/spark,skonto/spark,lxsmnv/spark,dongjoon-hyun/spark,eyalfa/spark,guoxiaolongzte/spark,jiangxb1987/spark,SHASHANKB/spark,poffuomo/spark,WeichenXu123/spark,tengpeng/spark,wangyum/spark,holdenk/spark,mike0sv/spark,liutang123/spark,matthewfranglen/spark,JoshRosen/spark,wzhfy/spark,nlalevee/spark,jrshust/spark,witgo/spark,saltstar/spark,xuanyuanking/spark,maropu/spark,jlopezmalla/spark,BryanCutler/spark,ueshin/apache-spark,bravo-zhang/spark,JoshRosen/spark,ptkool/spark,panfengfeng/spark,sahilTakiar/spark,alunarbeach/spark,apache/spark,LantaoJin/spark,jlopezmalla/spark,yanboliang/spark,markhamstra/spark,JerryLead/spark,jrshust/spark,dongjoon-hyun/spark,milliman/spark,debugger87/spark,tejasapatil/spark,mahak/spark,jlopezmalla/spark,metamx/spark,actuaryzhang/spark,szhem/spark,cin/spark,ptkool/spark,hhbyyh/spark,poffuomo/spark,hhbyyh/spark,UndeadBaneGitHub/spark,markhamstra/spark,szhem/spark,zzcclp/spark,MLnick/spark,liutang123/spark,nchammas/spark,taroplus/spark,rednaxelafx/apache-spark,michalsenkyr/spark,tejasapatil/spark,liutang123/spark,pgandhi999/spark,guoxiaolongzte/spark,minixalpha/spark,facaiy/spark,zuotingbing/spark,caneGuy/spark,JerryLead/spark,big-pegasus/spark,wangyum/spark,facaiy/spark,lxsmnv/spark,adrian-ionescu/apache-spark,dongjoon-hyun/spark,bOOm-X/spark,actuaryzhang/spark,vinodkc/spark,loneknightpy/spark,tejasapatil/spark,aosagie/spark,aosagie/spark,witgo/spark,andrewor14/spark,1haodian/spark,sahilTakiar/spark,guoxiaolongzte/spark,hvanhovell/spark,chuckchen/spark,adrian-ionescu/apache-spark,pgandhi999/spark,nchammas/spark,alunarbeach/spark,liyichao/spark,skonto/spark,kimoonkim/spark,mzl9039/spark,patrick-nicholson/spark,lvdongr/spark,rekhajoshm/spark,hhbyyh/spark,ioana-delaney/spark,ron8hu/spark,ajaysaini725/spark,andrewor14/spark,ueshin/apache-spark,ajaysaini725/spark,sachintyagi22/spark,zero323/spark,jkbradley/spark,cin/spark,nilsgrabbert/spark,aray/spark,dbtsai/spark,eyalfa/spark,techaddict/spark,shaneknapp/spark,gengliangwang/spark,kimoonkim/spark,wangmiao1981/spark,sachintyagi22/spark,LantaoJin/spark,dhruve/spark,someorz/spark,stanzhai/spark,skonto/spark,guoxiaolongzte/spark,techaddict/spark,hhbyyh/spark,yanboliang/spark,narahari92/spark,holdenk/spark,bdrillard/spark,Panos-Bletsos/spark-cost-model-optimizer,xuanyuanking/spark,akopich/spark,szhem/spark,actuaryzhang/spark,ConeyLiu/spark,spark-test/spark,sahilTakiar/spark,akopich/spark,jlopezmalla/spark,nchammas/spark,sahilTakiar/spark,ajaysaini725/spark,HyukjinKwon/spark,BryanCutler/spark,guoxiaolongzte/spark,bOOm-X/spark,SnappyDataInc/spark,dongjoon-hyun/spark,WindCanDie/spark,Panos-Bletsos/spark-cost-model-optimizer,michalsenkyr/spark,vinodkc/spark,dongjoon-hyun/spark,nilsgrabbert/spark,byakuinss/spark,ibm-research-ireland/sparkoscope,dbtsai/spark,apache/spark,Aegeaner/spark,lxsmnv/spark,aray/spark,LantaoJin/spark,narahari92/spark,gioenn/xSpark,wangyum/spark,srowen/spark,JerryLead/spark,maropu/spark,minixalpha/spark,rekhajoshm/spark,akopich/spark,wangmiao1981/spark,tejasapatil/spark,haowu80s/spark,UndeadBaneGitHub/spark,aokolnychyi/spark,alunarbeach/spark,icexelloss/spark,brad-kaiser/spark,maropu/spark,dongjoon-hyun/spark,loneknightpy/spark,dhruve/spark,ioana-delaney/spark,icexelloss/spark,adrian-ionescu/apache-spark,aray/spark,zzcclp/spark,esi-mineset/spark,JoshRosen/spark,stanzhai/spark,MLnick/spark,big-pegasus/spark,kissmetrics/spark,map222/spark,yanboliang/spark,liutang123/spark,szhem/spark,LantaoJin/spark,metamx/spark,jianran/spark,dhruve/spark,bdrillard/spark,SHASHANKB/spark,pronix/spark,liutang123/spark,xflin/spark,andrewor14/spark,shaneknapp/spark,cin/spark,sureshthalamati/spark,jrshust/spark,xflin/spark,zhouyejoe/spark,byakuinss/spark,tengpeng/spark,michalsenkyr/spark,holdenk/spark,nilsgrabbert/spark,mzl9039/spark,JoshRosen/spark,mahak/spark,zuotingbing/spark,hvanhovell/spark,rednaxelafx/apache-spark,bOOm-X/spark,zhouyejoe/spark,stanzhai/spark,gengliangwang/spark,rednaxelafx/apache-spark,map222/spark,huang1900/spark,publicRoman/spark,metamx/spark,alunarbeach/spark,zhouyejoe/spark,sachintyagi22/spark,joseph-torres/spark,milliman/spark,icexelloss/spark,ddna1021/spark,zzcclp/spark,joseph-torres/spark,eyalfa/spark,LantaoJin/spark,metamx/spark,MLnick/spark,nilsgrabbert/spark,rednaxelafx/apache-spark,szhem/spark,ConeyLiu/spark,liyichao/spark,sureshthalamati/spark,michalsenkyr/spark,map222/spark,haowu80s/spark,sahilTakiar/spark,mzl9039/spark,stanzhai/spark,witgo/spark,saturday-shi/spark,kiszk/spark,1haodian/spark,brad-kaiser/spark,Panos-Bletsos/spark-cost-model-optimizer,poffuomo/spark,pgandhi999/spark,janewangfb/spark,gengliangwang/spark,sureshthalamati/spark,zzcclp/spark,joseph-torres/spark,nlalevee/spark,narahari92/spark,wangyum/spark,apache/spark,jianran/spark,akopich/spark,map222/spark,WeichenXu123/spark,MLnick/spark,wzhfy/spark,gioenn/xSpark,patrick-nicholson/spark,mahak/spark,huang1900/spark,spark-test/spark,xflin/spark,someorz/spark,big-pegasus/spark,zzcclp/spark,markhamstra/spark,panfengfeng/spark,sachintyagi22/spark,xuanyuanking/spark,yanboliang/spark,apache-spark-on-k8s/spark,UndeadBaneGitHub/spark,JoshRosen/spark,aosagie/spark,sachintyagi22/spark,publicRoman/spark,caneGuy/spark,darionyaphet/spark,goldmedal/spark,michalsenkyr/spark,taroplus/spark,wangmiao1981/spark,kissmetrics/spark,shubhamchopra/spark,ericvandenbergfb/spark,WindCanDie/spark,HyukjinKwon/spark,shuangshuangwang/spark,ptkool/spark,zzcclp/spark,markhamstra/spark,zhouyejoe/spark,WeichenXu123/spark,yanboliang/spark,bdrillard/spark,cloud-fan/spark,pronix/spark,adrian-ionescu/apache-spark,saltstar/spark,esi-mineset/spark,srowen/spark,gengliangwang/spark,zuotingbing/spark,jrshust/spark,esi-mineset/spark,liyichao/spark,adrian-ionescu/apache-spark,big-pegasus/spark,facaiy/spark,darionyaphet/spark,someorz/spark,ibm-research-ireland/sparkoscope,highfei2011/spark,publicRoman/spark,ddna1021/spark,aosagie/spark,nilsgrabbert/spark,aray/spark,darionyaphet/spark,Aegeaner/spark,brad-kaiser/spark,wzhfy/spark,HyukjinKwon/spark,chuckchen/spark,icexelloss/spark,BryanCutler/spark,ConeyLiu/spark,cloud-fan/spark,ericvandenbergfb/spark,ioana-delaney/spark,wzhfy/spark,Aegeaner/spark,ahnqirage/spark,yanboliang/spark,gioenn/xSpark,milliman/spark,hhbyyh/spark,cloud-fan/spark,rekhajoshm/spark,milliman/spark,setjet/spark,darionyaphet/spark,map222/spark,ron8hu/spark,bravo-zhang/spark,ibm-research-ireland/sparkoscope,WeichenXu123/spark,janewangfb/spark,cin/spark,szhem/spark,mzl9039/spark,saturday-shi/spark,ibm-research-ireland/sparkoscope,debugger87/spark,kevinyu98/spark,pgandhi999/spark,aray/spark,hvanhovell/spark,highfei2011/spark,saltstar/spark,shaneknapp/spark,pronix/spark,rikima/spark,gengliangwang/spark,esi-mineset/spark,esi-mineset/spark,hvanhovell/spark,aokolnychyi/spark,saturday-shi/spark,milliman/spark,tejasapatil/spark,HyukjinKwon/spark,SnappyDataInc/spark,saturday-shi/spark,nchammas/spark,facaiy/spark,WindCanDie/spark,narahari92/spark,ron8hu/spark,loneknightpy/spark,joseph-torres/spark,ericvandenbergfb/spark,alunarbeach/spark,zhouyejoe/spark,ddna1021/spark,Aegeaner/spark,publicRoman/spark,1haodian/spark,pronix/spark,haowu80s/spark,kiszk/spark,kiszk/spark,1haodian/spark,aokolnychyi/spark,sachintyagi22/spark,shubhamchopra/spark,wangyum/spark,apache/spark,panfengfeng/spark,aray/spark,tengpeng/spark,jrshust/spark,poffuomo/spark,brad-kaiser/spark,ahnqirage/spark,janewangfb/spark,haowu80s/spark,highfei2011/spark,cloud-fan/spark,publicRoman/spark,lxsmnv/spark,saltstar/spark,minixalpha/spark,caneGuy/spark,loneknightpy/spark,ddna1021/spark,ConeyLiu/spark,WindCanDie/spark,icexelloss/spark,ibm-research-ireland/sparkoscope,rikima/spark,SnappyDataInc/spark,shuangshuangwang/spark,vinodkc/spark,janewangfb/spark,nlalevee/spark,map222/spark,panfengfeng/spark,BryanCutler/spark,loneknightpy/spark,MLnick/spark,maropu/spark,setjet/spark,shuangshuangwang/spark,Aegeaner/spark,saturday-shi/spark,kimoonkim/spark,esi-mineset/spark,gioenn/xSpark,WindCanDie/spark,ueshin/apache-spark,ptkool/spark,LantaoJin/spark,ahnqirage/spark,SHASHANKB/spark,rednaxelafx/apache-spark,jkbradley/spark,someorz/spark,bdrillard/spark,MLnick/spark,aokolnychyi/spark,zero323/spark,jianran/spark,adrian-ionescu/apache-spark,chuckchen/spark,rezasafi/spark,ericvandenbergfb/spark,highfei2011/spark,gioenn/xSpark,xuanyuanking/spark,jiangxb1987/spark,gengliangwang/spark,rezasafi/spark,panfengfeng/spark,taroplus/spark,hvanhovell/spark,JerryLead/spark,facaiy/spark,highfei2011/spark,wangmiao1981/spark,apache-spark-on-k8s/spark,icexelloss/spark,panfengfeng/spark,UndeadBaneGitHub/spark,milliman/spark,darionyaphet/spark,goldmedal/spark,kevinyu98/spark,xflin/spark,apache-spark-on-k8s/spark,srowen/spark,pgandhi999/spark,wangmiao1981/spark,mzl9039/spark,WindCanDie/spark,ahnqirage/spark,patrick-nicholson/spark,BryanCutler/spark,mdespriee/spark,zero323/spark,mahak/spark,aokolnychyi/spark,srowen/spark,lxsmnv/spark,ajaysaini725/spark,ahnqirage/spark,pgandhi999/spark,caneGuy/spark,WeichenXu123/spark,metamx/spark,maropu/spark,ahnqirage/spark,liyichao/spark,mike0sv/spark,setjet/spark,kissmetrics/spark,rezasafi/spark,ConeyLiu/spark,UndeadBaneGitHub/spark,dongjoon-hyun/spark,szhem/spark,debugger87/spark,nlalevee/spark,actuaryzhang/spark,shuangshuangwang/spark,huang1900/spark,highfei2011/spark,mike0sv/spark,aokolnychyi/spark,poffuomo/spark,spark-test/spark,byakuinss/spark,patrick-nicholson/spark,wangyum/spark,kiszk/spark,BryanCutler/spark,kimoonkim/spark,joseph-torres/spark,hhbyyh/spark,1haodian/spark,darionyaphet/spark,ibm-research-ireland/sparkoscope,tengpeng/spark,publicRoman/spark,dhruve/spark,mahak/spark,kiszk/spark,holdenk/spark,nchammas/spark,sachintyagi22/spark,JerryLead/spark,eyalfa/spark,hhbyyh/spark,nilsgrabbert/spark,tengpeng/spark,ddna1021/spark,lvdongr/spark,JoshRosen/spark,andrewor14/spark,mike0sv/spark,facaiy/spark,byakuinss/spark,andrewor14/spark,witgo/spark,techaddict/spark,janewangfb/spark,rezasafi/spark,shubhamchopra/spark,rikima/spark,rezasafi/spark,jiangxb1987/spark,map222/spark,techaddict/spark,bdrillard/spark,skonto/spark,sureshthalamati/spark,bOOm-X/spark,jkbradley/spark,caneGuy/spark,jlopezmalla/spark,wzhfy/spark,janewangfb/spark,ajaysaini725/spark,huang1900/spark,JerryLead/spark,mike0sv/spark,ioana-delaney/spark,pgandhi999/spark,vinodkc/spark,kevinyu98/spark,rezasafi/spark,actuaryzhang/spark,shuangshuangwang/spark,Panos-Bletsos/spark-cost-model-optimizer,lvdongr/spark,MLnick/spark,saturday-shi/spark,shaneknapp/spark,zero323/spark,mdespriee/spark,lxsmnv/spark,gioenn/xSpark,akopich/spark,techaddict/spark,aosagie/spark,akopich/spark,cloud-fan/spark,kevinyu98/spark,HyukjinKwon/spark,dbtsai/spark,wzhfy/spark,wangmiao1981/spark,mdespriee/spark,jiangxb1987/spark,gengliangwang/spark,WeichenXu123/spark,SnappyDataInc/spark,setjet/spark,holdenk/spark,cin/spark,jiangxb1987/spark,mzl9039/spark,ptkool/spark,huang1900/spark,jiangxb1987/spark,jrshust/spark,dbtsai/spark,minixalpha/spark,rikima/spark,saltstar/spark,kevinyu98/spark,big-pegasus/spark,alunarbeach/spark,chuckchen/spark,guoxiaolongzte/spark,SHASHANKB/spark,tengpeng/spark,apache-spark-on-k8s/spark,SnappyDataInc/spark,dhruve/spark,dhruve/spark,cin/spark,debugger87/spark,patrick-nicholson/spark,ConeyLiu/spark,srowen/spark,wzhfy/spark,yanboliang/spark,michalsenkyr/spark,apache/spark,rezasafi/spark,ericvandenbergfb/spark,narahari92/spark,narahari92/spark,shaneknapp/spark,jlopezmalla/spark,zero323/spark,brad-kaiser/spark,ptkool/spark,mdespriee/spark,zhouyejoe/spark,chuckchen/spark,kissmetrics/spark,mdespriee/spark,taroplus/spark,jianran/spark,ron8hu/spark,apache-spark-on-k8s/spark,aosagie/spark,metamx/spark,srowen/spark,jianran/spark,huang1900/spark,techaddict/spark,someorz/spark,janewangfb/spark,setjet/spark,kimoonkim/spark,cloud-fan/spark,spark-test/spark,rekhajoshm/spark,stanzhai/spark,hvanhovell/spark,zhouyejoe/spark,shaneknapp/spark,zuotingbing/spark,ibm-research-ireland/sparkoscope,kissmetrics/spark,kissmetrics/spark,lvdongr/spark,debugger87/spark,rednaxelafx/apache-spark,ueshin/apache-spark,debugger87/spark,liyichao/spark,aosagie/spark,tejasapatil/spark,1haodian/spark,nilsgrabbert/spark,Panos-Bletsos/spark-cost-model-optimizer,caneGuy/spark,liyichao/spark,wangmiao1981/spark,facaiy/spark,shuangshuangwang/spark,cloud-fan/spark,bOOm-X/spark,xflin/spark,zero323/spark,witgo/spark,rekhajoshm/spark,nchammas/spark,rekhajoshm/spark,markhamstra/spark,caneGuy/spark,ddna1021/spark,goldmedal/spark,chuckchen/spark,SnappyDataInc/spark,witgo/spark,jkbradley/spark,taroplus/spark,rekhajoshm/spark,kimoonkim/spark,pronix/spark,holdenk/spark,eyalfa/spark,nlalevee/spark,vinodkc/spark,jlopezmalla/spark,dbtsai/spark,skonto/spark,mdespriee/spark,kissmetrics/spark,JoshRosen/spark,joseph-torres/spark,gioenn/xSpark,ericvandenbergfb/spark,dhruve/spark,darionyaphet/spark,highfei2011/spark,WindCanDie/spark,byakuinss/spark,mahak/spark,alunarbeach/spark,ron8hu/spark,markhamstra/spark,xflin/spark,byakuinss/spark,Aegeaner/spark,xuanyuanking/spark,bravo-zhang/spark,big-pegasus/spark,ioana-delaney/spark,eyalfa/spark,SnappyDataInc/spark,shubhamchopra/spark,sureshthalamati/spark,LantaoJin/spark,jrshust/spark,bOOm-X/spark,aokolnychyi/spark,ioana-delaney/spark,shaneknapp/spark,andrewor14/spark,mdespriee/spark,saltstar/spark,nchammas/spark,BryanCutler/spark,lvdongr/spark,bravo-zhang/spark,bravo-zhang/spark,bravo-zhang/spark,lvdongr/spark,vinodkc/spark,ron8hu/spark