Comment 19 for bug 1591976

Reviewed: https://review.opencontrail.org/22721
Committed: http://github.org/Juniper/contrail-controller/commit/3408092005099c0ba2e9f1d3398f2c5d98467152
Submitter: Zuul
Branch: master

commit 3408092005099c0ba2e9f1d3398f2c5d98467152
Author: Édouard Thuleau <email address hidden>
Date: Mon Aug 1 18:00:21 2016 +0200

[VNC OpenStack] Remove stale security group rules

When a security group is deleted all security group rules which
reference it as 'remote_group_id' should be deleted.
As the contrail data model does not permit to easy found that rules,
that fix propose to clean that stale rules only when they are listed or
read.

[1] https://github.com/openstack/tempest/search?utf8=%E2%9C%93&q=test_security_group_rules_delete_when_peer_group_deleted&type=Code

Change-Id: Ifcd39f7f7b04c07cb6d4b62aa8aa90007f8bc81d
Closes-Bug: #1591976
(cherry picked from commit ad6a675556ec8bcbd53e9705e1a748ff0f866b00)