CCBC-373/CCBC-370: Return consistent host/port from lcb_get_host/port

Change-Id: I10286bf1fea12cefe7891a59a082e486864be057
Reviewed-on: http://review.couchbase.org/36401
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>