k8sutil: check PodSucceeded in CopyVolume
k8sutil: check PodSucceeded in CopyVolume

PodCompleted doesn’t check PodFailed state. As a result, PodFailed
could also exit and lead to non-error return. We should only return on
PodSucceeded condition.

icyxieex/operator,coreos/etcd-operator,hongchaodeng/etcd-operator,icyxieex/operator,coreos/etcd-operator,hongchaodeng/etcd-operator