Comment 5 for bug 1564575

Reviewed: https://review.openstack.org/319397
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=1f444899ca225846ac54ed9e33e112a30cc8bc0f
Submitter: Jenkins
Branch: stable/mitaka

commit 1f444899ca225846ac54ed9e33e112a30cc8bc0f
Author: Swaminathan Vasudevan <email address hidden>
Date: Thu Mar 31 17:48:09 2016 -0700

    DVR: Moving router from dvr_snat node removes the qrouters

    Removing the router from dvr_snat node removes the qrouters
    that are servicing the VM and dhcp ports.

    If there are still dvr serviceable ports in the dvr_snat node,
    and if router remove command is executed to remove the router
    association from the dvr_snat agent then only the snat
    functionality should be moved to the the different agent
    and the router namespaces should be untouched.

    This patch checks if there are any dvr serviceable ports for
    the dvr router and if exists, it will not send a router_remove
    message to the agent, but instead will send an router_update
    message to the agent.

    Change-Id: I5a3ba329346ab0d5ea7b0296ec64cc8e5fb4056d
    Closes-Bug: #1564575
    (cherry picked from commit c198710dc551bc0f79851a7801038b033088a8c2)