HOTFIX: Ignore python metastore files in RAT checks.
HOTFIX: Ignore python metastore files in RAT checks.

This was causing some errors with pull request tests.

Author: Patrick Wendell <pwendell@gmail.com>

Closes #393 from pwendell/hotfix and squashes the following commits:

6201dd3 [Patrick Wendell] HOTFIX: Ignore python metastore files in RAT checks.

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