add e2e test for enforcing enums in schema.
add e2e test for enforcing enums in schema.

ping035627/kubernetes,liggitt/kubernetes,zhangmingld/kubernetes,nckturner/kubernetes,openshift/kubernetes,kubernetes/kubernetes,jackfrancis/kubernetes,thockin/kubernetes,MikeSpreitzer/kubernetes,sdminonne/kubernetes,ii/kubernetes,MikeSpreitzer/kubernetes,deads2k/kubernetes,zhouhaibing089/kubernetes,nckturner/kubernetes,wongma7/kubernetes,carlory/kubernetes,csrwng/kubernetes,bparees/kubernetes,gnufied/kubernetes,thockin/kubernetes,gnufied/kubernetes,lojies/kubernetes,bparees/kubernetes,PiotrProkop/kubernetes,kevin-wangzefeng/kubernetes,feiskyer/kubernetes,csrwng/kubernetes,micahhausler/kubernetes,sdminonne/kubernetes,spzala/kubernetes,kevin-wangzefeng/kubernetes,warmchang/kubernetes,roberthbailey/kubernetes,rrati/kubernetes,olivierlemasle/kubernetes,soltysh/kubernetes,zhouhaibing089/kubernetes,fabriziopandini/kubernetes,jagosan/kubernetes,rafax/kubernetes,k82cn/kubernetes,deads2k/kubernetes,jackfrancis/kubernetes,jessfraz/kubernetes,mikebrow/kubernetes,iameli/kubernetes,mkumatag/kubernetes,shyamjvs/kubernetes,rnaveiras/kubernetes,spzala/kubernetes,soltysh/kubernetes,BenTheElder/kubernetes,GulajavaMinistudio/kubernetes,jsafrane/kubernetes,alejandroEsc/kubernetes,zhouhaibing089/kubernetes,zhangmingld/kubernetes,zhangmingld/kubernetes,openshift/kubernetes,lojies/kubernetes,chestack/kubernetes,iameli/kubernetes,nikhita/kubernetes,bparees/kubernetes,iameli/kubernetes,ping035627/kubernetes,matthyx/kubernetes,aledbf/kubernetes,dixudx/kubernetes,alejandroEsc/kubernetes,micahhausler/kubernetes,warmchang/kubernetes,liggitt/kubernetes,openshift/kubernetes,jagosan/kubernetes,PiotrProkop/kubernetes,li-ang/kubernetes,mikebrow/kubernetes,tengqm/kubernetes,nikhita/kubernetes,micahhausler/kubernetes,jagosan/kubernetes,mikedanese/kubernetes,rrati/kubernetes,deads2k/kubernetes,mikedanese/kubernetes,kevin-wangzefeng/kubernetes,aledbf/kubernetes,chestack/kubernetes,roberthbailey/kubernetes,dixudx/kubernetes,kubernetes/kubernetes,mengqiy/kubernetes,rrati/kubernetes,jessfraz/kubernetes,mikebrow/kubernetes,humblec/kubernetes,dixudx/kubernetes,kevin-wangzefeng/kubernetes,jingxu97/kubernetes,PiotrProkop/kubernetes,jessfraz/kubernetes,MikeSpreitzer/kubernetes,zhouhaibing089/kubernetes,k82cn/kubernetes,mengqiy/kubernetes,linux-on-ibm-z/kubernetes,tengqm/kubernetes,jingxu97/kubernetes,zhouhaibing089/kubernetes,chestack/kubernetes,csrwng/kubernetes,deads2k/kubernetes,k82/kubernetes,bparees/kubernetes,enj/kubernetes,mosoft521/kubernetes,spzala/kubernetes,nikhita/kubernetes,ravilr/kubernetes,tengqm/kubernetes,zhangmingld/kubernetes,kubernetes/kubernetes,jingxu97/kubernetes,fabriziopandini/kubernetes,chestack/kubernetes,feiskyer/kubernetes,iameli/kubernetes,BenTheElder/kubernetes,mikebrow/kubernetes,verb/kubernetes,csrwng/kubernetes,rnaveiras/kubernetes,mikebrow/kubernetes,wongma7/kubernetes,GulajavaMinistudio/kubernetes,nckturner/kubernetes,mengqiy/kubernetes,mosoft521/kubernetes,shyamjvs/kubernetes,ii/kubernetes,aledbf/kubernetes,feiskyer/kubernetes,jsafrane/kubernetes,linux-on-ibm-z/kubernetes,shyamjvs/kubernetes,matthyx/kubernetes,fanzhangio/kubernetes,aledbf/kubernetes,mosoft521/kubernetes,rafax/kubernetes,alejandroEsc/kubernetes,MikeSpreitzer/kubernetes,k82/kubernetes,mahak/kubernetes,sdminonne/kubernetes,fanzhangio/kubernetes,jsafrane/kubernetes,mikedanese/kubernetes,kevin-wangzefeng/kubernetes,carlory/kubernetes,linux-on-ibm-z/kubernetes,monopole/kubernetes,k82/kubernetes,spzala/kubernetes,dixudx/kubernetes,dims/kubernetes,spzala/kubernetes,sdminonne/kubernetes,liggitt/kubernetes,carlory/kubernetes,BenTheElder/kubernetes,verb/kubernetes,ravilr/kubernetes,monopole/kubernetes,jagosan/kubernetes,fabriziopandini/kubernetes,kubernetes/kubernetes,ii/kubernetes,GulajavaMinistudio/kubernetes,humblec/kubernetes,mosoft521/kubernetes,mengqiy/kubernetes,carlory/kubernetes,cblecker/kubernetes,mahak/kubernetes,rrati/kubernetes,mkumatag/kubernetes,jsafrane/kubernetes,bparees/kubernetes,kubernetes/kubernetes,olivierlemasle/kubernetes,wongma7/kubernetes,warmchang/kubernetes,humblec/kubernetes,BenTheElder/kubernetes,cblecker/kubernetes,chestack/kubernetes,tengqm/kubernetes,lojies/kubernetes,feiskyer/kubernetes,csrwng/kubernetes,fabriziopandini/kubernetes,micahhausler/kubernetes,ping035627/kubernetes,verb/kubernetes,jessfraz/kubernetes,enj/kubernetes,humblec/kubernetes,jingxu97/kubernetes,shyamjvs/kubernetes,mikedanese/kubernetes,zhangmingld/kubernetes,li-ang/kubernetes,mkumatag/kubernetes,alejandroEsc/kubernetes,linux-on-ibm-z/kubernetes,BenTheElder/kubernetes,openshift/kubernetes,carlory/kubernetes,cblecker/kubernetes,monopole/kubernetes,GulajavaMinistudio/kubernetes,soltysh/kubernetes,soltysh/kubernetes,enj/kubernetes,liggitt/kubernetes,enj/kubernetes,humblec/kubernetes,iameli/kubernetes,mahak/kubernetes,jackfrancis/kubernetes,rafax/kubernetes,cblecker/kubernetes,verb/kubernetes,nikhita/kubernetes,GulajavaMinistudio/kubernetes,rafax/kubernetes,ii/kubernetes,ii/kubernetes,ravilr/kubernetes,micahhausler/kubernetes,gnufied/kubernetes,sdminonne/kubernetes,shyamjvs/kubernetes,mikedanese/kubernetes,mkumatag/kubernetes,li-ang/kubernetes,PiotrProkop/kubernetes,ravilr/kubernetes,deads2k/kubernetes,fanzhangio/kubernetes,feiskyer/kubernetes,k82cn/kubernetes,rnaveiras/kubernetes,PiotrProkop/kubernetes,wongma7/kubernetes,k82/kubernetes,roberthbailey/kubernetes,matthyx/kubernetes,mosoft521/kubernetes,jackfrancis/kubernetes,dims/kubernetes,verb/kubernetes,matthyx/kubernetes,k82/kubernetes,jsafrane/kubernetes,mahak/kubernetes,olivierlemasle/kubernetes,tengqm/kubernetes,monopole/kubernetes,thockin/kubernetes,olivierlemasle/kubernetes,soltysh/kubernetes,jingxu97/kubernetes,lojies/kubernetes,li-ang/kubernetes,zhangmingld/kubernetes,matthyx/kubernetes,k82cn/kubernetes,wongma7/kubernetes,thockin/kubernetes,rnaveiras/kubernetes,MikeSpreitzer/kubernetes,nckturner/kubernetes,nckturner/kubernetes,lojies/kubernetes,jackfrancis/kubernetes,enj/kubernetes,cblecker/kubernetes,openshift/kubernetes,k82cn/kubernetes,olivierlemasle/kubernetes,roberthbailey/kubernetes,li-ang/kubernetes,dims/kubernetes,warmchang/kubernetes,mahak/kubernetes,liggitt/kubernetes,monopole/kubernetes,ravilr/kubernetes,rnaveiras/kubernetes,dixudx/kubernetes,roberthbailey/kubernetes,alejandroEsc/kubernetes,ping035627/kubernetes,jagosan/kubernetes,ping035627/kubernetes,fanzhangio/kubernetes,mkumatag/kubernetes,fanzhangio/kubernetes,mengqiy/kubernetes,fanzhangio/kubernetes,rrati/kubernetes,thockin/kubernetes,dims/kubernetes,gnufied/kubernetes,jessfraz/kubernetes,warmchang/kubernetes,nikhita/kubernetes,fabriziopandini/kubernetes,linux-on-ibm-z/kubernetes,dims/kubernetes,aledbf/kubernetes,gnufied/kubernetes