message: storage: recover one unit test case
  It's a temporary solution to recover a unit test case by sleeping
  longer, more work needed.
diff: @@ -283,7 +283,6 @@ mod tests {
  assert_eq!(server.state.active_workers.load(Ordering::Relaxed), 0);
  }
  - /*
  #[test]
  fn test_reconnect() {
  let tmpdir = TempDir::new().unwrap();
  @@ -294,13 +293,13 @@ mod tests {
  let client = Client::new(&server.sock);
  client.connect().unwrap();
  - std::thread::sleep(Duration::from_secs(1));
  + std::thread::sleep(Duration::from_secs(4));
  let client = Arc::new(client);
  Client::start(client.clone()).unwrap();
  client.call_ping().unwrap();
  server.stop();
  - std::thread::sleep(Duration::from_secs(1));
  + std::thread::sleep(Duration::from_secs(4));
  assert_eq!(server.state.active_workers.load(Ordering::Relaxed), 0);
  drop(server);
  @@ -308,5 +307,4 @@ mod tests {
  Server::start(server).unwrap();
  client.call_ping().unwrap();
  }
  - */
  }
  