nvp: update network gateway name on backend as well

[Salvatore Orlando]

when a network gateway name is updated the plugin currently only the neutron database is updated; it might be useful to propagate the update to the backend.

This breaks a use case when network gateways created in neutron need then to be processed by other tools finding them in nvp by name.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/62322

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/62322
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=a3bd88c21c8eb94d45f24987cb740aa185cf901a
Submitter: Jenkins
Branch: master

commit a3bd88c21c8eb94d45f24987cb740aa185cf901a
Author: Salvatore Orlando <email address hidden>
Date: Fri Dec 13 14:49:00 2013 -0800

    NVP: propagate net-gw update to backend

    When a network gateway's name is updated, propagate the
    update to the backend.

    Closes-Bug: #1261334
    Change-Id: Icaae84e7f5373946e8c82e0e519528409925dd9d

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/62324
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=d7047f9d34bd210ad471f4698bfac85423c4741b
Submitter: Jenkins
Branch: stable/havana

commit d7047f9d34bd210ad471f4698bfac85423c4741b
Author: Salvatore Orlando <email address hidden>
Date: Fri Dec 13 14:49:00 2013 -0800

    NVP: propagate net-gw update to backend

    When a network gateway's name is updated, propagate the
    update to the backend.

    Closes-Bug: #1261334
    Change-Id: Icaae84e7f5373946e8c82e0e519528409925dd9d