When tcp service's host is unreachable, wait-on should exit with status code 0 in reverse mode

[TKasperczyk]

Let's assume that the following IP address is unreachable: 1.2.3.4. When you execute wait-on tcp:1.2.3.4:554 -r, the command should exit after a short time with code 0 because the service is not available. Unfortunately, it doesn't exit at all. I think it's because you don't have a timeout event handler in the createTcp$ function. I propose to add an additional option called "tcpTimeout" and the timeout event handler which would mirror the behaviour of the error handler.