Comment 39 for bug 1509312

Reviewed: https://review.openstack.org/299204
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=d1618c91075e32b1d3f58869b02065f4e0709c49
Submitter: Jenkins
Branch: stable/liberty

commit d1618c91075e32b1d3f58869b02065f4e0709c49
Author: Ihar Hrachyshka <email address hidden>
Date: Thu Mar 17 16:20:52 2016 +0100

    port security: gracefully handle resources with no bindings

    Resources could be created before the extension was enabled in the
    setup. In that case, no bindings are created for them. In that case, we
    should gracefully return default (True) value when extracting the value
    using the mixin; and we should also create binding model on update
    request, if there is no existing binding model for the resource.

    While at it, introduced a constant to store the default value for port
    security (True) and changed several tests to use the constant instead of
    extracting it from extension resource map.

    Change-Id: I8607cdecdc16c5f94635c94e2f02700c732806eb
    Closes-Bug: #1509312
    (cherry picked from commit b0519cf0ada3b3d9b76f84948f9ad3c142fc50be)