Comment 6 for bug 1649503

Reviewed: https://review.openstack.org/465956
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=33f49eb195802bd08f85bcba05f626545cc8d7ce
Submitter: Jenkins
Branch: stable/ocata

commit 33f49eb195802bd08f85bcba05f626545cc8d7ce
Author: Hong Hui Xiao <email address hidden>
Date: Tue Dec 13 16:29:08 2016 +0800

    Retrieve fresh network DB data before getting it in ml2

    The DB objects that have join relationship with network, will be
    acquired once during a DB transaction.
    However, if they are updated after the first acquisition, the network
    DB model object maintains the older value, and doesnt update it.

    After cd7d63bde92e47a4b7bd4212b2e6c45f08c03143, the updated network
    is retrieved from the db causing this bug.
    This patch retrieves the latest data for these DB objects so that
    updated information can be used.

    Change-Id: Ic8935008515bed687ad3abd00c8ccaf656a30452
    Closes-Bug: #1649503
    (cherry-pick from commit e5ad765484e546b9f857a91c0fea41ebfd87adab)