MB-11722: Don't set couch_port when creating a bucket

We're removing the couch notifier from ep-engine so this
parameter is no longer valid.

Removed unused parameter: couch_port

Change-Id: I8fa97838b1b539f718c1f001875002dd4996e2cc
Reviewed-on: http://review.couchbase.org/38834
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>