Abstract RxNettyModule for connection oriented protocols with concrete implementation for TCP.

TCP servers can be started with ```com.netflix.karyon.KaryonTcpServer``` main class, similarly to HTTP specific ```com.netflix.karyon.KaryonServer```.
These per protocol main classes do not scale, and do not solve the problem of running multiple servers at the same time. We need more flexible solution here.
 
Did you mean 'return without blocking' instead of 'exit'.  'Exit' can be confused with the application being shutdown.