e2e: use version.Cluster for release test
e2e: use version.Cluster for release test

Signed-off-by: Gyu-Ho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

fanminshi/etcd,lorneli/etcd,coreos/etcd,mickep76/etcd,sebrandon1/etcd,mkumatag/etcd,mqliang/etcd,bdarnell/etcd,ajityagaty/etcd,vimalk78/etcd,dannysauer/etcd,gyuho/etcd,mkumatag/etcd,etcd-io/etcd,visheshnp/etcd,gyuho/etcd,mqliang/etcd,joshix/etcd,akauppi/etcd,whuwxl/etcd,bdarnell/etcd,sinsharat/etcd,akauppi/etcd,bluebreezecf/etcd,a-robinson/etcd,joshix/etcd,armstrongli/etcd,a-robinson/etcd,vimalk78/etcd,etcd-io/etcd,fanminshi/etcd,lorneli/etcd,whuwxl/etcd,rnaveiras/etcd,rnaveiras/etcd,mkumatag/etcd,heyitsanthony/etcd,sebrandon1/etcd,ajityagaty/etcd,rnaveiras/etcd,cockroachdb/etcd,YuleiXiao/etcd,dannysauer/etcd,sinsharat/etcd,ajityagaty/etcd,bluebreezecf/etcd,heyitsanthony/etcd,cockroachdb/etcd,mickep76/etcd,li-ang/etcd,glevand/coreos--etcd,glevand/coreos--etcd,li-ang/etcd,armstrongli/etcd,etcd-io/etcd,coreos/etcd,YuleiXiao/etcd,mqliang/etcd,visheshnp/etcd,xiang90/etcd,xiang90/etcd