Added license header for tox.ini.
Added license header for tox.ini.

(cherry picked from commit fa541f32c5b92e6868a9c99cbb2c87115d624d23)
Signed-off-by: Reynold Xin <c9d35a384bc579d1c6c8c055f2a2b5c04e11b521@apache.org>

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