Port binding is not getting updated on DHCP rescheduling

[Eugene Nikanorov]

Tunnels are not getting built properly when DHCP port is rescheduled because port binding is not getting update.
Also, it can affect thrid-party plugins that would not wire new DHCP port properly without correct host.

Upstream bug: https://bugs.launchpad.net/neutron/+bug/1411163

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/12351
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-6.1/2014.2

Commit: ec1526900a1f7285dfc3f1e56b0105a790c86484
Author: venkata anil <email address hidden>
Date: Thu Dec 3 09:34:49 2015

Update dhcp host portbinding on failover

When a dhcp server is moved to new host on failover,
tunnel is not created.

When a dhcp server is moved to new host,
1) network-hostagent binding is updated(properly i.e with new host).
2) dhcp port-hostagent binding is not updated
   ( dhcp port is still bound to old host)
If dhcp port-bound agent is different from the new dhcp agent
(which is now taking care of this dhcp port), neutron plugin won't
 notify the l2pop, and hence tunnel is not created.

As after failover, the new agent is taking care of this dhcp port,
update portbinding with the new host. This will allow neutron plugin
to notify l2pop(which will create tunnel).

Cherry-picked from: 571453c614577ffd47e23de9a35863d2f2119583
Change-Id: Ib7d7dcddee005395af116ccd31a43853332ae317
Closes-bug: #1522334

[Alexey Stupnikov (astupnikov)]

yum whatprovides /usr/lib/python2.6/site-packages/neutron/api/rpc/handlers/dhcp_rpc.py
Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
python-neutron-2014.2.2-fuel6.1.mira34.noarch : Neutron Python libraries
Repo : mos-security
Matched from:
Filename : /usr/lib/python2.6/site-packages/neutron/api/rpc/handlers/dhcp_rpc.py

[Alexey Stupnikov (astupnikov)]

Verified on Fuel-6.1 (Ubuntu&Centos)