Comment 19 for bug 1609217

Reviewed: https://review.opendev.org/364793
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8f057fb49ac637bd0dbf60ca07b89f0e4a59c7b7
Submitter: Zuul
Branch: master

commit 8f057fb49ac637bd0dbf60ca07b89f0e4a59c7b7
Author: LIU Yulong <email address hidden>
Date: Fri Aug 19 10:16:44 2016 +0800

    DVR: Ignore DHCP port during DVR host query

    For large scale deployment, the dvr router will be installed to
    the scheduled DHCP host. This will definitely increase the l3
    agent service pressure, especially in large number of concurrent
    updates, creation, or agent restart.

    This patch adds a config ``host_dvr_for_dhcp`` for the DHCP port
    device_owner filter during DVR host query. Then if we set
    ``host_dvr_for_dhcp = False``, L3-agent will not host the DVR router
    namespace in its connected networks' DHCP agent hosts.

    Closes-Bug: #1609217
    Change-Id: I53e20be9b306bf9d3b34ec6a31e3afabd5a0fd6f