Comment 2 for bug 1699034

Reviewed: https://review.openstack.org/475646
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=43eb75fd1d7c99b42293d723626bc48434479ee4
Submitter: Jenkins
Branch: master

commit 43eb75fd1d7c99b42293d723626bc48434479ee4
Author: Kevin Benton <email address hidden>
Date: Mon Jun 19 16:58:45 2017 -0700

    Add revises_on_change to Binding DB models

    All of the ML2 binding models were missing the revises_on_change
    attribute to bump the revision of the port whenever they are
    created/updated/deleted.

    These are important because port binding happens in a separate
    transaction so without them the revision number before and after
    port binding was exactly the same. This opened up the L2 agent
    to a race condition dependent on the order of processed push
    notifications.

    Closes-Bug: #1699034
    Change-Id: I75f3c63941130ce845574e60214ac34e99111693