Comment 1 for bug 1716243

Reviewed: https://review.openstack.org/502331
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=4d228320921fbb74d8e5c88c860099fc298a88fc
Submitter: Jenkins
Branch: master

commit 4d228320921fbb74d8e5c88c860099fc298a88fc
Author: Kevin Benton <email address hidden>
Date: Sun Sep 10 08:59:23 2017 -0700

    Remove gw_port expire call

    This was initially added as part of the patch here:
    I09e8a694cdff7f64a642a39b45cbd12422132806
    However, it doesn't serve a purpose anymore because nothing
    references the gateway port DB object before it is deleted.

    Closes-Bug: #1716243
    Change-Id: I87b614f8aef73aab8b5dd8217c99db1fe3ade742