Revisit start-re-manager CLI parameterization

[danielballan]

Looking to other examples for inspiration, it might make sense to replace --zmq-addr with separate parameters:

--hostname (localhost by default)
--port (conventional default port by default)
--protocol (tcp by default, but in the future ssl, ucx?)

If we are concerned with backward-compatible for our small userbase, we can still support --zmq-addr for a time.

[danielballan]

Regarding our discussion about addr vs address, I think the default behavior of argparse will let both be happy. By default, it tolerates abbreviations as long as they are unambigous: https://docs.python.org/3/library/argparse.html#allow-abbrev

Thus, we can use ...-address if/when it comes up but ...-addr will also work, as a general feature of argparse. (Many, though not all, UNIX utilities work this way too.) @jklynch has made me a zealot for clear, reader-oriented naming schemes. :-D