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 .
 add new unittest
 fixbug: RpcClientChannel::IsConnected
 when call peer::Close**, Reset them into epoll
 make notify_queue as pointer
if connected failed, close fd
 .
 add unittest RPC.Reconnect
 .
 .
 remove CloseOnError
 .
 add sync short-connection unittest
 RPC.ShortConnection passed
 found bug: core at rpc_client_channel.cc:305, ssession->response->ParseFromArray
 user pointer for meta
 add check errno on accept event when retval > 0
 add vlog
 add vlog