Stale external gateway devices left behind

[Carl Baldwin]

This is a follow on to https://bugs.launchpad.net/neutron/+bug/1244853.

I found today that the same problem can happen with external gateway devices. Those should be identified and removed in a manner similar to the fix before the other bug.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/83624

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/83624
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=80eb1faf1b9466176a0fbf1f8a8b18cb500c6811
Submitter: Jenkins
Branch: master

commit 80eb1faf1b9466176a0fbf1f8a8b18cb500c6811
Author: Carl Baldwin <email address hidden>
Date: Thu Mar 27 22:21:53 2014 +0000

    Delete duplicate external devices in router namespace

    When a router's gateway is removed during L3-agent restart, the agent
    will fail to delete the old external device. This device should be
    identified and removed as soon as possible.

    Change-Id: Ifd3e6ca009242138bea4a098e3fde258aeaa391e
    Closes-Bug: #1298658