Use volinfo->client_op_version during server_getspec check.

Change-Id: I33b0dd4c2b2fbf6c5e8f1e59e05ca4cd6a5322a0
fix segfault

Change-Id: If222901701e0ca04a7f2dcf2b6cc526fd93fe70a
Fix wrong assignment

Change-Id: Id750cd239d52abc67b8672cbfae9406c32eb5caf
Default volume op-versions to cluster op-version

Change-Id: I7e7ef00be33ec10af9a03c9293e7d61f49ee1117
Update volume op-versions on create

Change-Id: I961990efd01f69b36d09626f18cb3ee883eacb9e