ml2 l2-pop update fdb after live-migration

[Mathieu Rohon]

when using ml2 and l2-population is enabled, fdb of virtual switches has to be updated, especially, the fdb entry to the previous host has to be deleted.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/59671

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/61767

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/75916

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/61767
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=809d9f3dc5a8aa332e7eacf3d681720042b5e9b7
Submitter: Jenkins
Branch: master

commit 809d9f3dc5a8aa332e7eacf3d681720042b5e9b7
Author: mathieu-rohon <email address hidden>
Date: Fri Mar 14 10:17:55 2014 +0100

    Send fdb remove message when a port is migrated

    the fdb_remove rpc message is sent when the status
    of the port goes to BUILD, that is when the new host
    send a get_device_details which means that it owns
    the migrated port. The fdb_add message will be sent
    as soon as the new host send update_device_up

    Closes bug: #1237841

    Change-Id: Ibdc7768d8db922b7e6eb9dc505382168cbb8e55d