tests: add a new e2e test case for the combination of non empty CN and grpc proxy
tests: add a new e2e test case for the combination of non empty CN and grpc proxy

joshix/etcd,rnaveiras/etcd,coreos/etcd,dannysauer/etcd,cockroachdb/etcd,ajityagaty/etcd,rnaveiras/etcd,ajityagaty/etcd,gyuho/etcd,etcd-io/etcd,joshix/etcd,dannysauer/etcd,etcd-io/etcd,coreos/etcd,li-ang/etcd,etcd-io/etcd,rnaveiras/etcd,mqliang/etcd,ajityagaty/etcd,mkumatag/etcd,li-ang/etcd,mkumatag/etcd,mkumatag/etcd,mqliang/etcd,mqliang/etcd,gyuho/etcd,cockroachdb/etcd