Use tcp manager when "tcp_manager" feature is on

[s1341]

[andreafioraldi]

I don't get this. LLMP TCP etc can coexist, we don't need a new feature

[andreafioraldi]

I think the way to go here to avoid code reuse is a macro that define Launcher with different names (CentralizedLauncher, TCPLauncher etc) changing the trait bound to the different kind of managers

[s1341]

Are you sure?

[domenukk]

Yes sounds good. We might also have other launchers for other managers in the future

[domenukk]

As long as we don't have a better idea, maybe we want to merge this anyway? It's useful to have a tcpmanager enabled launcher sometimes..

[tokatoka]

#2302 will supercede tcp manager