MB-11888: moved enterpriseness detection into ns_config_default

And we now store it in config.

Change-Id: Ibb95ae0428ef4c6b3e78f2f474b805e5d267b9bb
Reviewed-on: http://review.couchbase.org/40451
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>