stop treating moxi as configurable service

Because moxi is obsolete and doesn't really need to be configurable.

Change-Id: I983caf73ceb416e200401dec16e2932d336b8b05
Reviewed-on: http://review.couchbase.org/44405
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>