storage e2e: fix volume metric test for generic ephemeral volume
storage e2e: fix volume metric test for generic ephemeral volume

This is a fix for the new test case from
https://github.com/kubernetes/kubernetes/pull/105636 which had to be merged
without prior testing due to not having a cluster to test on and no pull job
which runs these
tests. https://testgrid.k8s.io/sig-storage-kubernetes#gce-serial then showed a
failure.

The fix is simple: in the ephemeral case, the PVC name isn't set in advance in
pvc.Name and instead must be computed. The fix now was tested on a kubetest
cluster in GCE.

Signed-off-by: Patrick Ohly <0fc9d825c622b2a5ac5160289c29f03654b10648@intel.com>

li-ang/kubernetes,cblecker/kubernetes,dixudx/kubernetes,ping035627/kubernetes,MikeSpreitzer/kubernetes,monopole/kubernetes,iameli/kubernetes,verb/kubernetes,dims/kubernetes,li-ang/kubernetes,ii/kubernetes,carlory/kubernetes,warmchang/kubernetes,jackfrancis/kubernetes,monopole/kubernetes,jessfraz/kubernetes,fabriziopandini/kubernetes,hex108/kubernetes,mikebrow/kubernetes,olivierlemasle/kubernetes,thockin/kubernetes,jingxu97/kubernetes,roberthbailey/kubernetes,wongma7/kubernetes,hex108/kubernetes,k82/kubernetes,PiotrProkop/kubernetes,nikhita/kubernetes,kubernetes/kubernetes,openshift/kubernetes,dims/kubernetes,deads2k/kubernetes,li-ang/kubernetes,thockin/kubernetes,liggitt/kubernetes,mkumatag/kubernetes,soltysh/kubernetes,jagosan/kubernetes,zhouhaibing089/kubernetes,zhouhaibing089/kubernetes,GulajavaMinistudio/kubernetes,fanzhangio/kubernetes,lojies/kubernetes,olivierlemasle/kubernetes,zhangmingld/kubernetes,spzala/kubernetes,cblecker/kubernetes,micahhausler/kubernetes,rnaveiras/kubernetes,k82cn/kubernetes,nikhita/kubernetes,tengqm/kubernetes,rnaveiras/kubernetes,gnufied/kubernetes,verb/kubernetes,GulajavaMinistudio/kubernetes,jackfrancis/kubernetes,zhouhaibing089/kubernetes,MikeSpreitzer/kubernetes,nckturner/kubernetes,liggitt/kubernetes,ii/kubernetes,deads2k/kubernetes,zhangmingld/kubernetes,linux-on-ibm-z/kubernetes,chestack/kubernetes,rnaveiras/kubernetes,mengqiy/kubernetes,shyamjvs/kubernetes,ping035627/kubernetes,bparees/kubernetes,mkumatag/kubernetes,carlory/kubernetes,csrwng/kubernetes,hex108/kubernetes,olivierlemasle/kubernetes,humblec/kubernetes,wongma7/kubernetes,liggitt/kubernetes,roberthbailey/kubernetes,shyamjvs/kubernetes,dims/kubernetes,humblec/kubernetes,soltysh/kubernetes,fabriziopandini/kubernetes,kevin-wangzefeng/kubernetes,BenTheElder/kubernetes,carlory/kubernetes,roberthbailey/kubernetes,csrwng/kubernetes,monopole/kubernetes,iameli/kubernetes,verb/kubernetes,mikebrow/kubernetes,zhouhaibing089/kubernetes,mengqiy/kubernetes,fanzhangio/kubernetes,jessfraz/kubernetes,zhangmingld/kubernetes,ping035627/kubernetes,linux-on-ibm-z/kubernetes,alejandroEsc/kubernetes,jagosan/kubernetes,BenTheElder/kubernetes,feiskyer/kubernetes,mengqiy/kubernetes,rrati/kubernetes,iameli/kubernetes,matthyx/kubernetes,chestack/kubernetes,wongma7/kubernetes,warmchang/kubernetes,tengqm/kubernetes,kevin-wangzefeng/kubernetes,ravilr/kubernetes,zhangmingld/kubernetes,mosoft521/kubernetes,nckturner/kubernetes,PiotrProkop/kubernetes,k82cn/kubernetes,MikeSpreitzer/kubernetes,jessfraz/kubernetes,bparees/kubernetes,zhouhaibing089/kubernetes,sdminonne/kubernetes,monopole/kubernetes,mengqiy/kubernetes,tengqm/kubernetes,matthyx/kubernetes,BenTheElder/kubernetes,spzala/kubernetes,k82cn/kubernetes,monopole/kubernetes,hex108/kubernetes,jingxu97/kubernetes,sdminonne/kubernetes,aledbf/kubernetes,nckturner/kubernetes,cblecker/kubernetes,bparees/kubernetes,csrwng/kubernetes,dixudx/kubernetes,mkumatag/kubernetes,kubernetes/kubernetes,GulajavaMinistudio/kubernetes,mikebrow/kubernetes,feiskyer/kubernetes,jessfraz/kubernetes,micahhausler/kubernetes,thockin/kubernetes,rrati/kubernetes,rnaveiras/kubernetes,li-ang/kubernetes,deads2k/kubernetes,ravilr/kubernetes,alejandroEsc/kubernetes,jsafrane/kubernetes,li-ang/kubernetes,gnufied/kubernetes,ping035627/kubernetes,fabriziopandini/kubernetes,humblec/kubernetes,mahak/kubernetes,mikebrow/kubernetes,openshift/kubernetes,rnaveiras/kubernetes,enj/kubernetes,spzala/kubernetes,verb/kubernetes,lojies/kubernetes,dims/kubernetes,jsafrane/kubernetes,ii/kubernetes,mikebrow/kubernetes,matthyx/kubernetes,cblecker/kubernetes,ravilr/kubernetes,fanzhangio/kubernetes,jsafrane/kubernetes,MikeSpreitzer/kubernetes,kubernetes/kubernetes,roberthbailey/kubernetes,mahak/kubernetes,enj/kubernetes,zhangmingld/kubernetes,soltysh/kubernetes,bparees/kubernetes,rrati/kubernetes,sdminonne/kubernetes,nikhita/kubernetes,dixudx/kubernetes,cblecker/kubernetes,openshift/kubernetes,micahhausler/kubernetes,alejandroEsc/kubernetes,k82/kubernetes,mikedanese/kubernetes,mosoft521/kubernetes,enj/kubernetes,hex108/kubernetes,enj/kubernetes,fanzhangio/kubernetes,alejandroEsc/kubernetes,dixudx/kubernetes,lojies/kubernetes,jsafrane/kubernetes,spzala/kubernetes,jingxu97/kubernetes,ii/kubernetes,aledbf/kubernetes,gnufied/kubernetes,nckturner/kubernetes,matthyx/kubernetes,mikedanese/kubernetes,carlory/kubernetes,kevin-wangzefeng/kubernetes,ii/kubernetes,ping035627/kubernetes,mosoft521/kubernetes,spzala/kubernetes,ravilr/kubernetes,mikedanese/kubernetes,kevin-wangzefeng/kubernetes,k82cn/kubernetes,dims/kubernetes,liggitt/kubernetes,rafax/kubernetes,jackfrancis/kubernetes,jackfrancis/kubernetes,chestack/kubernetes,jagosan/kubernetes,jagosan/kubernetes,iameli/kubernetes,kevin-wangzefeng/kubernetes,aledbf/kubernetes,hex108/kubernetes,carlory/kubernetes,soltysh/kubernetes,PiotrProkop/kubernetes,fabriziopandini/kubernetes,deads2k/kubernetes,mahak/kubernetes,MikeSpreitzer/kubernetes,shyamjvs/kubernetes,lojies/kubernetes,jsafrane/kubernetes,tengqm/kubern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