Comment 9 for bug 1948457

Reviewed: https://review.opendev.org/c/openstack/neutron/+/823401
Committed: https://opendev.org/openstack/neutron/commit/f7f083c9da48106ae2450fcb94aa16b9f41de71b
Submitter: "Zuul (22348)"
Branch: stable/victoria

commit f7f083c9da48106ae2450fcb94aa16b9f41de71b
Author: Arnau Verdaguer <email address hidden>
Date: Wed Nov 17 16:59:28 2021 +0100

    [OVN] Prevent deleting the only IP of a router port

    Neutron allows deleting the only IP of a router port but
    the OVN NB DB doesn't, since it expects that the
    network value of a port is greater than 0. This should
    not be possible since it causes that the DB are not
    perfectly sync.

    It is needed to check BEFORE_UPDATE if the port
    that will be updated is of type router owned and
    if it will have an IP after the update. If not
    an error needs to be raised.

    Compared to master patch, this has changed payload to kwargs
    Conflicts:
        neutron/services/ovn_l3/plugin.py

    Closes-Bug: #1948457
    Change-Id: I206c31201470f178efdde8839622be7900c6ae3e
    (cherry picked from commit 935c88032bd3c0e501c70a18c0f1eb3cfc67c1f0)