big switch L3: missing tenant ID for external gateway causes expensive query on backend

[Kevin Benton]

The external gateway info in the router update only includes the network_id. Even though this is a unique ID on the openstack side, this field isn't unique on the backend so the query is very expensive. The plugin side should just lookup the network and include it in the request to the backend.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/135460

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/135460
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=1825b0fdf9b383566c5f509108b88de39ca0bc31
Submitter: Jenkins
Branch: master

commit 1825b0fdf9b383566c5f509108b88de39ca0bc31
Author: Kevin Benton <email address hidden>
Date: Mon Nov 17 23:12:03 2014 -0800

    BSN: Add network to ext_gw_info sent to backend

    Include the full network info in the external gateway info
    sent to the backend controller. This alleviates a very expensive
    query across all tenants on the backend controller.

    Closes-Bug: #1393991
    Change-Id: If3601ccbce21e683924a7056cdfe4e3c2d4d4a93