set default value of KUBE_MASTER_URL to empty
set default value of KUBE_MASTER_URL to empty

johscheuer/kubernetes,iterion/kubernetes,shyamjvs/kubernetes,pwittrock/kubernetes,mikedanese/kubernetes,jackfrancis/kubernetes,chrislovecnm/kubernetes,wanghaoran1988/kubernetes,pires/kubernetes,sanjeevm0/kubernetes,coolsvap/kubernetes,aledbf/kubernetes,nckturner/kubernetes,PI-Victor/kubernetes,tomzhang/kubernetes,ravisantoshgudimetla/kubernetes,linux-on-ibm-z/kubernetes,cofyc/kubernetes,mfojtik/kubernetes,johscheuer/kubernetes,khenidak/kubernetes,frodenas/kubernetes,pweil-/kubernetes,zetaab/kubernetes,pmorie/kubernetes,Acidburn0zzz/kubernetes,jingxu97/kubernetes,carlory/kubernetes,huangjiuyuan/kubernetes,davidz627/kubernetes,wenlxie/kubernetes,olivierlemasle/kubernetes,fgimenez/kubernetes,nckturner/kubernetes,warmchang/kubernetes,fanzhangio/kubernetes,derekwaynecarr/kubernetes,yujuhong/kubernetes,cblecker/kubernetes,Lion-Wei/kubernetes,frodenas/kubernetes,fgimenez/kubernetes,jfrazelle/kubernetes,jdef/kubernetes,zhouhaibing089/kubernetes,roberthbailey/kubernetes,dereknex/kubernetes,stevesloka/kubernetes,saad-ali/kubernetes,MHBauer/kubernetes,idvoretskyi/kubernetes,Clarifai/kubernetes,cblecker/kubernetes,micahhausler/kubernetes,bizhao/kubernetes,Lion-Wei/kubernetes,mengqiy/kubernetes,jfrazelle/kubernetes,andrewrynhard/kubernetes,pires/kubernetes,dlorenc/kubernetes,mosoft521/kubernetes,k82/kubernetes,rnaveiras/kubernetes,dlorenc/kubernetes,nikhita/kubernetes,luxas/kubernetes,xlgao-zju/kubernetes,Lion-Wei/kubernetes,jfrazelle/kubernetes,kitt1987/kubernetes,LalatenduMohanty/kubernetes,zetaab/kubernetes,jfrazelle/kubernetes,nikhita/kubernetes,mYmNeo/kubernetes,jagosan/kubernetes,feiskyer/kubernetes,x13n/kubernetes,tallclair/kubernetes,nak3/kubernetes,fgimenez/kubernetes,MHBauer/kubernetes,monopole/kubernetes,matthyx/kubernetes,monopole/kubernetes,wenlxie/kubernetes,x13n/kubernetes,pweil-/kubernetes,tomzhang/kubernetes,klaus1982/kubernetes,csrwng/kubernetes,fejta/kubernetes,deads2k/kubernetes,cofyc/kubernetes,ravilr/kubernetes,weiwei04/kubernetes,nckturner/kubernetes,pwittrock/kubernetes,yarntime/kubernetes,BenTheElder/kubernetes,pmorie/kubernetes,LalatenduMohanty/kubernetes,nikhita/kubernetes,ingvagabund/kubernetes,liggitt/kubernetes,iameli/kubernetes,openshift/kubernetes,fabriziopandini/kubernetes,mahak/kubernetes,bizhao/kubernetes,cofyc/kubernetes,zhouhaibing089/kubernetes,carlory/kubernetes,chrislovecnm/kubernetes,chestack/kubernetes,yarntime/kubernetes,hex108/kubernetes,jdef/kubernetes,enj/kubernetes,cmluciano/kubernetes,brendandburns/kubernetes,gnufied/kubernetes,dereknex/kubernetes,hex108/kubernetes,hex108/kubernetes,coolsvap/kubernetes,tomerf/kubernetes,PiotrProkop/kubernetes,tallclair/kubernetes,jessfraz/kubernetes,njuicsgz/kubernetes-1,rafax/kubernetes,jagosan/kubernetes,davidz627/kubernetes,tcnghia/kubernetes,ravilr/kubernetes,PI-Victor/kubernetes,bparees/kubernetes,tallclair/kubernetes,fgimenez/kubernetes,verult/kubernetes,brendandburns/kubernetes,jdef/kubernetes,pires/kubernetes,aveshagarwal/kubernetes,verult/kubernetes,du2016/kubernetes,kpgriffith/kubernetes,gnufied/kubernetes,davidz627/kubernetes,tcnghia/kubernetes,wongma7/kubernetes,tengqm/kubernetes,gnufied/kubernetes,verb/kubernetes,kpgriffith/kubernetes,andrewsykim/kubernetes,roberthbailey/kubernetes,jingxu97/kubernetes,mkumatag/kubernetes,sethpollack/kubernetes,luxas/kubernetes,ixdy/kubernetes,k82/kubernetes,matthyx/kubernetes,stevesloka/kubernetes,joelsmith/kubernetes,pwittrock/kubernetes,tengqm/kubernetes,xychu/kubernetes,sanjeevm0/kubernetes,micahhausler/kubernetes,carlory/kubernetes,huangjiuyuan/kubernetes,kitt1987/kubernetes,huangjiuyuan/kubernetes,kubernetes/kubernetes,johscheuer/kubernetes,huangjiuyuan/kubernetes,wanghaoran1988/kubernetes,mengqiy/kubernetes,verb/kubernetes,enj/kubernetes,klaus1982/kubernetes,sethpollack/kubernetes,zhangmingld/kubernetes,JacobTanenbaum/kubernetes,soltysh/kubernetes,kubernetes/kubernetes,alejandroEsc/kubernetes,saad-ali/kubernetes,gnufied/kubernetes,MikeSpreitzer/kubernetes,aledbf/kubernetes,feiskyer/kubernetes,ii/kubernetes,huangjiuyuan/kubernetes,mYmNeo/kubernetes,mikedanese/kubernetes,khenidak/kubernetes,dims/kubernetes,u2takey/kubernetes,dixudx/kubernetes,MikeSpreitzer/kubernetes,MHBauer/kubernetes,mfojtik/kubernetes,maciaszczykm/kubernetes,cadmuxe/kubernetes,idvoretskyi/kubernetes,mikebrow/kubernetes,jessfraz/kubernetes,roberthbailey/kubernetes,kitt1987/kubernetes,kevin-wangzefeng/kubernetes,x13n/kubernetes,verb/kubernetes,ii/kubernetes,u2takey/kubernetes,csrwng/kubernetes,deads2k/kubernetes,wanghaoran1988/kubernetes,enj/kubernetes,MikeSpreitzer/kubernetes,kevensen/kubernetes,nak3/kubernetes,Clarifai/kubernetes,xychu/kubernetes,stevesloka/kubernetes,tcnghia/kubernetes,spzala/kubernetes,krmayankk/kubernetes,rnaveiras/kubernetes,idvoretskyi/kubernetes,aveshagarwal/kubernetes,huangjiuyuan/kubernetes,jdef/kubernetes,andrewrynhard/kubernetes,sethpollack/kubernetes,krmayankk/kubernetes,yujuhong/kubernetes,mikebrow/kubernetes,mikebrow/kubernetes,jessfraz/kubernetes,humblec/kubernetes,wanghaoran1988/kubernetes,nckturner/kubernetes,zhouhaibing089/kubernetes,ixdy/kubernetes,fabriziopandini/kubernetes,ingvagabund/kubernetes,fabriziopandini/kubernetes,MHBauer/kubernetes,nak3/kubernetes,luxas/kubernetes,sanjeevm0/kubernetes,xychu/kubernetes,fanzhangio/kubernetes,andrewsykim/kubernetes,andrewsykim/kubernetes,yarntime/kubernetes,chrislovecnm/kubernetes,pweil-/kubernetes,nikhita/kubernetes,maciaszczykm/kubernetes,linux-on-ibm-z/kubernetes,cblecker/kubernetes,mboersma/kubernetes,Clarifai/kubernetes,sdminonne/kubernetes,fejta/kubernetes,Acidburn0zzz/kubernetes,jsafrane/kubernetes,Acidburn0zzz/kubernetes,mboersma/kubernetes,jessfraz/kubernetes,kubernetes/kubernetes,dims/kubernetes,ping035627/kubernetes,kubernetes/kubernetes,ravisantoshgudimetla/kubernetes,linux-on-ibm-z/kubernetes,roberthbailey/kubernetes,kitt1987/kubernetes,weiwei04/kubernetes,du2016/kubernetes,BenTheElder/kubernetes,du2016/kubernetes,nikhita/kubernetes,liggitt/kubernetes,dixudx/kubernetes,u2takey/kubernetes,roberthbailey/kubernetes,maciaszczykm/kubernetes,tomzhang/kubernetes,ravisantoshgudimetla/kubernetes,thockin/kubernetes,joelsmith/kubernetes,MikeSpreitzer/kubernetes,erwinvaneyk/kubernetes,PiotrProkop/kubernetes,iterion/kubernetes,rrati/kubernetes,PiotrProkop/kubernetes,dims/kubernetes,feiskyer/kubernetes,k82/kubernetes,du2016/kubernetes,tpepper/kubernetes,LalatenduMohanty/kubernetes,ping035627/kubernetes,ingvagabund/kubernetes,thockin/kubernetes,PiotrProkop/kubernetes,micahhausler/kubernetes,xlgao-zju/kubernetes,hex108/kubernetes,klaus1982/kubernetes,BenTheElder/kubernetes,krmayankk/kubernetes,GulajavaMinistudio/kubernetes,njuicsgz/kubernetes-1,sanjeevm0/kubernetes,cmluciano/kubernetes,jingxu97/kubernetes,frodenas/kubernetes,ixdy/kubernetes,x13n/kubernetes,mosoft521/kubernetes,weiwei04/kubernetes,pweil-/kubernetes,openshift/kubernetes,xychu/kubernetes,deads2k/kubernetes,PI-Victor/kubernetes,idvoretskyi/kubernetes,kevensen/kubernetes,kevensen/kubernetes,mikedanese/kubernetes,ravisantoshgudimetla/kubernetes,x13n/kubernetes,warmchang/kubernetes,kitt1987/kubernetes,stevesloka/kubernetes,andrewsykim/kubernetes,csrwng/kubernetes,joelsmith/kubernetes,matthyx/kubernetes,erwinvaneyk/kubernetes,du2016/kubernetes,li-ang/kubernetes,tengqm/kubernetes,zhouhaibing089/kubernetes,mosoft521/kubernetes,joelsmith/kubernetes,sethpollack/kubernetes,bparees/kubernetes,csrwng/kubernetes,mfojtik/kubernetes,shyamjvs/kubernetes,shyamjvs/kubernetes,pwittrock/kubernetes,Clarifai/kubernetes,mkumatag/kubernetes,spzala/kubernetes,luxas/kubernetes,li-ang/kubernetes,kitt1987/kubernetes,lojies/kubernetes,k82/kubernetes,feiskyer/kubernetes,mahak/kubernetes,aveshagarwal/kubernetes,mboersma/kubernetes,monopole/kubernetes,monopole/kubernetes,luxas/kubernetes,pmorie/kubernetes,spzala/kubernetes,kpgriffith/kubernetes,bizhao/kubernetes,cmluciano/kubernetes,hex108/kubernetes,deads2k/kubernetes,mikedanese/kubernetes,frodenas/kubernetes,mengqiy/kubernetes,mkumatag/kubernetes,olivierlemasle/kubernetes,mosoft521/kubernetes,LalatenduMohanty/kubernetes,krmayankk/kubernetes,monopole/kubernetes,MikeSpreitzer/kubernetes,u2takey/kubernetes,soltysh/kubernetes,kevin-wangzefeng/kubernetes,BenTheElder/kubernetes,stevesloka/kubernetes,tomzhang/kubernetes,mfojtik/kubernetes,mahak/kubernetes,dixudx/kubernetes,sanjeevm0/kubernetes,olivierlemasle/kubernetes,deads2k/kubernetes,cblecker/kubernetes,ping035627/kubernetes,tpepper/kubernetes,rrati/kubernetes,matthyx/kubernetes,tpepper/kubernetes,humblec/kubernetes,maciaszczykm/kubernetes,rafax/kubernetes,nak3/kubernetes,GulajavaMinistudio/kubernetes,andrewsykim/kubernetes,zhangmingld/kubernetes,kpgriffith/kubernetes,dims/kubernetes,mboersma/kubernetes,tpepper/kubernetes,cadmuxe/kubernetes,tomzhang/kubernetes,joelsmith/kubernetes,wongma7/kubernetes,carlory/kubernetes,brendandburns/kubernetes,Acidburn0zzz/kubernetes,ping035627/kubernetes,GulajavaMinistudio/kubernetes,wanghaoran1988/kubernetes,aledbf/kubernetes,iterion/kubernetes,li-ang/kubernetes,GulajavaMinistudio/kubernetes,wongma7/kubernetes,ravilr/kubernetes,zhangmingld/kubernetes,fgimenez/kubernetes,BenTheElder/kubernetes,verb/kubernetes,mahak/kubernetes,yarntime/kubernetes,li-ang/kubernetes,lojies/kubernetes,openshift/kubernetes,fanzhangio/kubernetes,njuicsgz/kubernetes-1,liggitt/kubernetes,khenidak/kubernetes,Lion-Wei/kubernetes,cmluciano/kubernetes,liggitt/kubernetes,JacobTanenbaum/kubernetes,cadmuxe/kubernetes,tallclair/kubernetes,feiskyer/kubernetes,johscheuer/kubernetes,alejandroEsc/kubernetes,wenlxie/kubernetes,iterion/kubernetes,mengqiy/kubernetes,davidz627/kubernetes,chrislovecnm/kubernetes,chestack/kubernetes,alejandroEsc/kubernetes,njuicsgz/kubernetes-1,tengqm/kubernetes,xlgao-zju/kubernetes,rrati/kubernetes,ii/kubernetes,kubernetes/kubernetes,xychu/kubernetes,coolsvap/kubernetes,li-ang/kubernetes,sethpollack/kubernetes,jackfrancis/kubernetes,pires/kubernetes,nak3/kubernetes,johscheuer/kubernetes,yujuhong/kubernetes,jsafrane/kubernetes,dims/kubernetes,PiotrProkop/kubernetes,kpgriffith/kubernetes,wanghaoran1988/kubernetes,GulajavaMinistudio/kubernetes,dlorenc/kubernetes,coolsvap/kubernetes,jagosan/kubernetes,jdef/kubernetes,tpepper/kubernetes,jfrazelle/kubernetes,k82cn/kubernetes,ixdy/kubernetes,pmorie/kubernetes,verult/kubernetes,saad-ali/kubernetes,mboersma/kubernetes,LalatenduMohanty/kubernetes,iterion/kubernetes,maciaszczykm/kubernetes,iameli/kubernetes,dereknex/kubernetes,kevin-wangzefeng/kubernetes,kevin-wangzefeng/kubernetes,mYmNeo/kubernetes,zetaab/kubernetes,yujuhong/kubernetes,iameli/kubernetes,idvoretskyi/kubernetes,spzala/kubernetes,openshift/kubernetes,nak3/kubernetes,thockin/kubernetes,zhangmingld/kubernetes,brendandburns/kubernetes,Lion-Wei/kubernetes,Acidburn0zzz/kubernetes,sdminonne/kubernetes,humblec/kubernetes,ii/kubernetes,zhangmingld/kubernetes,cofyc/kubernetes,pweil-/kubernetes,yujuhong/kubernetes,PI-Victor/kubernetes,chrislovecnm/kubernetes,micahhausler/kubernetes,MHBauer/kubernetes,jackfrancis/kubernetes,alejandroEsc/kubernetes,derekwaynecarr/kubernetes,ravilr/kubernetes,jingxu97/kubernetes,andrewrynhard/kubernetes,chestack/kubernetes,verult/kubernetes,bizhao/kubernetes,tomerf/kubernetes,pweil-/kubernetes,xlgao-zju/kubernetes,fejta/kubernetes,ixdy/kubernetes,rnaveiras/kubernetes,dixudx/kubernetes,ravilr/kubernetes,zetaab/kubernetes,xlgao-zju/kubernetes,zetaab/kubernetes,yarntime/kubernetes,zetaab/kubernetes,andrewrynhard/kubernetes,sdminonne/kubernetes,yujuhong/kubernetes,njuicsgz/kubernetes-1,mYmNeo/kubernetes,lojies/kubernetes,andrewsykim/kubernetes,sdminonne/kubernetes,thockin/kubernetes,humblec/kubernetes,brendandburns/kubernetes,olivierlemasle/kubernetes,ii/kubernetes,cmluciano/kubernetes,iameli/kubernetes,tomerf/kubernetes,krmayankk/kubernetes,tomzhang/kubernetes,cblecker/kubernetes,tomerf/kubernetes,jdef/kubernetes,JacobTanenbaum/kubernetes,khenidak/kubernetes,soltysh/kubernetes,rrati/kubernetes,mkumatag/kubernetes,fejta/kubernetes,pires/kubernetes,mYmNeo/kubernetes,k82cn/kubernetes,cadmuxe/kubernetes,mikebrow/kubernetes,frodenas/kubernetes,tcnghia/kubernetes,linux-on-ibm-z/kubernetes,weiwei04/kubernetes,derekwaynecarr/kubernetes,bparees/kubernetes,ravisantoshgudimetla/kubernetes,jagosan/kubernetes,gnufied/kubernetes,tallclair/kubernetes,johscheuer/kubernetes,chestack/kubernetes,weiwei04/kubernetes,x13n/kubernetes,tomerf/kubernetes,csrwng/kubernetes,hex108/kubernetes,k82cn/kubernetes,kpgriffith/kubernetes,cadmuxe/kubernetes,jsafrane/kubernetes,mfojtik/kubernetes,aveshagarwal/kubernetes,mikebrow/kubernetes,saad-ali/kubernetes,dixudx/kubernetes,JacobTanenbaum/kubernetes,derekwaynecarr/kubernetes,frodenas/kubernetes,lojies/kubernetes,erwinvaneyk/kubernetes,sdminonne/kubernetes,mosoft521/kubernetes,aledbf/kubernetes,mfojtik/kubernetes,verb/kubernetes,cofyc/kubernetes,tpepper/kubernetes,kevin-wangzefeng/kubernetes,mkumatag/kubernetes,dlorenc/kubernetes,bizhao/kubernetes,jagosan/kubernetes,brendandburns/kubernetes,dlorenc/kubernetes,khenidak/kubernetes,Acidburn0zzz/kubernetes,dereknex/kubernetes,njuicsgz/kubernetes-1,kevensen/kubernetes,pmorie/kubernetes,tomzhang/kubernetes,pwittrock/kubernetes,Lion-Wei/kubernetes,mboersma/kubernetes,coolsvap/kubernetes,openshift/kubernetes,ping035627/kubernetes,weiwei04/kubernetes,shyamjvs/kubernetes,davidz627/kubernetes,ingvagabund/kubernetes,khenidak/kubernetes,fejta/kubernetes,aledbf/kubernetes,bizhao/kubernetes,joelsmith/kubernetes,cmluciano/kubernetes,MHBauer/kubernetes,erwinvaneyk/kubernetes,tcnghia/kubernetes,njuicsgz/kubernetes-1,thockin/kubernetes,dereknex/kubernetes,tcnghia/kubernetes,derekwaynecarr/kubernetes,saad-ali/kubernetes,lojies/kubernetes,chestack/kubernetes,fanzhangio/kubernetes,soltysh/kubernetes,rafax/kubernetes,k82cn/kubernetes,bparees/kubernetes,verult/kubernetes,u2takey/kubernetes,zhouhaibing089/kubernetes,tomzhang/kubernetes,aveshagarwal/kubernetes,rnaveiras/kubernetes,linux-on-ibm-z/kubernetes,jessfraz/kubernetes,aveshagarwal/kubernetes,klaus1982/kubernetes,zhangmingld/kubernetes,rrati/kubernetes,mengqiy/kubernetes,u2takey/kubernetes,davidz627/kubernetes,sanjeevm0/kubernetes,tengqm/kubernetes,soltysh/kubernetes,wongma7/kubernetes,verult/kubernetes,enj/kubernetes,jackfrancis/kubernetes,ixdy/kubernetes,idvoretskyi/kubernetes,PI-Victor/kubernetes,rnaveiras/kubernetes,xychu/kubernetes,alejandroEsc/kubernetes,jackfrancis/kubernetes,ingvagabund/kubernetes,kevensen/kubernetes,pmorie/kubernetes,njuicsgz/kubernetes-1,fanzhangio/kubernetes,matthyx/kubernetes,jingxu97/kubernetes,derekwaynecarr/kubernetes,k82/kubernetes,erwinvaneyk/kubernetes,mboersma/kubernetes,JacobTanenbaum/kubernetes,iameli/kubernetes,rafax/kubernetes,shyamjvs/kubernetes,andrewrynhard/kubernetes,mYmNeo/kubernetes,jsafrane/kubernetes,warmchang/kubernetes,dlorenc/kubernetes,spzala/kubernetes,cadmuxe/kubernetes,fabriziopandini/kubernetes,erwinvaneyk/kubernetes,mikedanese/kubernetes,ravisantoshgudimetla/kubernetes,mboersma/kubernetes,wenlxie/kubernetes,andrewrynhard/kubernetes,enj/kubernetes,tallclair/kubernetes,fabriziopandini/kubernetes,cofyc/kubernetes,k82cn/kubernetes,mahak/kubernetes,carlory/kubernetes,fejta/kubernetes,xlgao-zju/kubernetes,warmchang/kubernetes,pires/kubernetes,iterion/kubernetes,saad-ali/kubernetes,yarntime/kubernetes,dereknex/kubernetes,maciaszczykm/kubernetes,tomzhang/kubernetes,PI-Victor/kubernetes,tomerf/kubernetes,humblec/kubernetes,fanzhangio/kubernetes,warmchang/kubernetes,bparees/kubernetes,stevesloka/kubernetes,luxas/kubernetes,jsafrane/kubernetes,pwittrock/kubernetes,JacobTanenbaum/kubernetes,micahhausler/kubernetes,Clarifai/kubernetes,wongma7/kubernetes,LalatenduMohanty/kubernetes,nckturner/kubernetes,olivierlemasle/kubernetes,coolsvap/kubernetes,wenlxie/kubernetes,fgimenez/kubernetes,krmayankk/kubernetes,chrislovecnm/kubernetes,ingvagabund/kubernetes,wenlxie/kubernetes,liggitt/kubernetes,Clarifai/kubernetes