Move tcp-mon, connection and service manager supervisors from replication to core.

This is the matching PR for replication below. This is the final move to migrate the connection and service
managers from replication into their proper home in core. The riak_core_tcp_mon supervisor also belongs here.

If you build/test this on riak_ee, you will need the following PR as well, which is recently rebased on develop.
https://github.com/basho/riak_repl/pull/398