missing physical_network attribute in binding:profile for mlnx ML2 MD

[Irena Berezovsky]

Due to non merged patches in nova that should support propagating physical_network attribute as part of the VIF /Network object:
1. retrieve physical network via provider extension: https://review.openstack.org/#/c/59093/
2. potentially propagate vif_details to VIFDriver https://review.openstack.org/#/c/44596/

Need to add temporary solution in order to support multiple physical networks by mlnx ML2 MD.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/81281

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/81281
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=218d51e087ab5fc713f8d9edb66d515d833efdbb
Submitter: Jenkins
Branch: master

commit 218d51e087ab5fc713f8d9edb66d515d833efdbb
Author: Irena Berezovsky <email address hidden>
Date: Tue Mar 18 16:35:35 2014 +0200

    Add update binding:profile with physical_network

    Add temporary solution in order to support multiple physical networks
    by mlnx ML2 MechanismDriver.
    Due to non merged patches in nova that should support propagating
    physical_network retrieved from port binding:profile attribute
    to VIF/Network object.
    The code will be removed once relevant nova patches are merged.
    The code is disabled by default and should be enabled via
    ml2_conf_mlnx.ini config file.

    Change-Id: I815f9e28774efd47bccd1c57481e6ba89075792b
    Closes-bug: #1291209