[SPARK-5668] Display region in spark_ec2.py get_existing_cluster()
[SPARK-5668] Display region in spark_ec2.py get_existing_cluster()

Show the region for the different messages displayed by get_existing_cluster(): The search, found and error messages.

Author: Miguel Peralvo <miguel.peralvo@gmail.com>

Closes #4457 from MiguelPeralvo/patch-2 and squashes the following commits:

a5514c8 [Miguel Peralvo] Update spark_ec2.py
0a837b0 [Miguel Peralvo] Update spark_ec2.py
3923f36 [Miguel Peralvo] Update spark_ec2.py
4ecd9f9 [Miguel Peralvo] [SPARK-5668] Display region in spark_ec2.py get_existing_cluster()

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