message: bugfix the monitor presentation form is inconsistent with redis
diff: @@ -76,7 +76,7 @@ std::string PikaClientConn::DoCmd(
  bool is_monitoring = g_pika_server->HasMonitorClients();
  if (is_monitoring) {
  monitor_message = std::to_string(1.0*slash::NowMicros()/1000000) +
  - " [" + this->ip_port() + "]";
  + " [0 " + this->ip_port() + "]";
  for (PikaCmdArgsType::iterator iter = argv.begin(); iter != argv.end(); iter++) {
  monitor_message += " " + slash::ToRead(*iter);
  }
  