stop, start and destroy require the EC2_REGION
stop, start and destroy require the EC2_REGION

i.e
./spark-ec2 --region=us-west-1 stop yourclustername

Author: Jeff Steinmetz <jeffrey.steinmetz@gmail.com>

Closes #2473 from jeffsteinmetz/master and squashes the following commits:

7491f2c [Jeff Steinmetz] fix case in EC2 cluster setup documentation
bd3d777 [Jeff Steinmetz] standardized ec2 documenation to use <lower-case> sample args
2bf4a57 [Jeff Steinmetz] standardized ec2 documenation to use <lower-case> sample args
68d8372 [Jeff Steinmetz] standardized ec2 documenation to use <lower-case> sample args
d2ab6e2 [Jeff Steinmetz] standardized ec2 documenation to use <lower-case> sample args
520e6dc [Jeff Steinmetz] standardized ec2 documenation to use <lower-case> sample args
37fc876 [Jeff Steinmetz] stop, start and destroy require the EC2_REGION

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