dropped support for writing port config files

Because it's not used anymore

Change-Id: I5869b84e894c303e74f3d7342707a2f7dfbd1d3f
Reviewed-on: http://review.couchbase.org/42016
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>