Connect in reconnect should use callback provided by user in latest connect

[andrew-aladev]

We are loosing callback that user provided for socket.connect by using connect() in reconnect.

[andrew-aladev]

I've fixed this by using this.connectCallback = this.connectCallback || callback; the same way as this.host = host || this.host; but I don't want to provide a pull request.

The reason is: why connect is not designed for multiple connect calls?

socket.connect(port1, host1, callback1);
socket.connect(port2);

The second call will use host1 and callback1. It doesn't looks good for user.