Comment 9 for bug 1493714

Reviewed: https://review.openstack.org/482839
Committed: https://git.openstack.org/cgit/openstack/neutron-lib/commit/?id=6a2040fcdb62b44d63757f3fc9ac13a8f7537c82
Submitter: Jenkins
Branch: master

commit 6a2040fcdb62b44d63757f3fc9ac13a8f7537c82
Author: Kevin Benton <email address hidden>
Date: Wed Jul 12 01:09:22 2017 -0700

    Add interface to add a constraint to context

    This adds methods to the Context to add, remove, and get a
    constraint on an object to be checked before a change is
    made to that object.

    Related-Bug: #1493714
    Change-Id: Id01c4dfb740f680e96349dc08b11b5bca6c59a74