Major Description
Found it when backporting the new rpc implementation to branch-1 in HBASE-16584. It will cause TestHCM fail on branch-1 as on branch-1 the default rpc implementation is BlockingRpcClient which is not always reconnectable after shutdown. On master TestHCM will not fail as NettyRpcConnection is always reconnectable. But we still need to fix it as it is a bug. Only a trivial one line patch.