Comment 4 for bug 1554825

Reviewed: https://review.openstack.org/290216
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=aa00310eef0d2507c4da76eb5dd5130df043b0a5
Submitter: Jenkins
Branch: master

commit aa00310eef0d2507c4da76eb5dd5130df043b0a5
Author: Shih-Hao Li <email address hidden>
Date: Fri Mar 11 15:13:34 2016 -0800

    Update network object in DHCP agent with router interface changes

    In Dnsmasq, the function get_isolated_subnets() returns a list of
    subnets in a network if the subnet is not connected to a router.

    The implementation of this function checks all the router interface
    ports in a cached network object passed from DHCP agent. But the
    cached network object is not updated when a subnet is attached to
    or detached from a router.

    This patch fixes that by adding callback functions in DHCP RPC client
    to notify DHCP agent when changes happen on router interfaces.

    Closes-Bug: #1554825
    Change-Id: Ifaab163f49e0d1c5cb3eba6efa96214104647e4e