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.
 
It may be possible to do this using governator's @Modules with PrivateModule.  With that said, child injectors can be very problematic.  If possible we should try to find a solution which does not require child injectors.