Comment 11 for bug 1802369

Reviewed: https://review.openstack.org/617119
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=593c04d10d9d67cc6f864ff37416951dd28584f5
Submitter: Zuul
Branch: master

commit 593c04d10d9d67cc6f864ff37416951dd28584f5
Author: Slawek Kaplonski <email address hidden>
Date: Sat Nov 10 15:48:20 2018 +0100

    Import neutron.db.api module in common.utils

    Patch [1] removed import of neutron.db.api module in
    neutron.common.utils.
    This cause some issues e.g. in networking-ovn projects because
    listeners:

    @event.listens_for(orm.session.Session, "persistent_to_deleted")
    on _persistent_to_deleted() function [2] and

    @event.listens_for(model_base.BASEV2, "attribute_instrument", propagate=True)
    on _listen_for_changes() function [3]

    aren't created as they where before.

    This patch adds import of this neutron.db.api module again just to
    ensure that those listeners are created properly.

    [1] https://review.openstack.org/#/c/614252/
    [2] https://github.com/openstack/neutron/blob/master/neutron/db/api.py#L110
    [3] https://github.com/openstack/neutron/blob/master/neutron/db/api.py#L134

    Closes-Bug: #1802369

    Change-Id: I3e427ee5c904c34115aaf1afa67e1109ea58d603