Comment 10 for bug 1563070

Reviewed: https://review.openstack.org/298443
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=3f71a49e0f0603175e0d0f599ab4d73118b0e85a
Submitter: Jenkins
Branch: master

commit 3f71a49e0f0603175e0d0f599ab4d73118b0e85a
Author: Kevin Benton <email address hidden>
Date: Mon Mar 28 14:14:15 2016 -0700

    Change external_network_bridge default to ''

    This changes the default for external_network_bridge to '' to
    encourage operators to deploy L3 agents in the correct manner.

    This patch also adds a functional test to ensure that namespaces
    with an existing external gateway interface are not torn down and
    rewired on change.

    Closes-Bug: #1563070
    Change-Id: If533cf7c4c379be78f5a15073accaff7f65973ab