message: when monitor thread write message EAGAIN, wait one second for client consume messages
diff: @@ -133,11 +133,14 @@ pink::WriteStatus PikaMonitorThread::SendMessage(int32_t fd, std::string& messag
  if (++retry >= 10) {
  return pink::kWriteError;
  } else {
  + // Sleep one second wait for client consume message
  + sleep(1);
  continue;
  }
  } else if (nwritten == -1) {
  return pink::kWriteError;
  }
  + if (retry > 0) retry = 0;
  message_len_sended += nwritten;
  message_len_left -= nwritten;
  }
  