support prefix delegation in HA router

[Baodong (Robert) Li]

Prefix delegation was introduced in regular neutron router since Liberty. But it doesn't work in neutron HA router. This bug is opened to add its support in neutron HA router.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/413137

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/413137
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bb3c0e8285783b655427a3896f928831c6033deb
Submitter: Jenkins
Branch: master

commit bb3c0e8285783b655427a3896f928831c6033deb
Author: Robert Li <email address hidden>
Date: Tue Dec 20 10:21:21 2016 -0500

    Add PD support in HA router

    The following enhancements are added:
      -- PD keeps track of status of neutron routers: active or
         standalone (master), or standby (not master),
      -- PD DHCP clients are only spawned in the active router. In the
         standby router, PD keeps track of the assigned prefixes, but
         doesn't spawn DHCP clients.
      -- When switchover occurs, on the router becoming standby, PD
         clients are "killed" so that they don't send prefix withdrawals
         to the DHCP server. On the router becoming active, PD spawns DHCP
         clients with the assigned prefixes configured as hints in the
         DHCP client's configuration

    Closes-Bug: #1651465
    Change-Id: I17df98128c7a88e72e31251687f30f569df6b860

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 11.0.0.0b1 development milestone.