Comment 8 for bug 1857016

Reviewed: https://review.opendev.org/700007
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=474bff078c9c9e736f86b7394320661bde70eaf4
Submitter: Zuul
Branch: master

commit 474bff078c9c9e736f86b7394320661bde70eaf4
Author: Terry Wilson <email address hidden>
Date: Thu Dec 19 09:17:50 2019 -0600

    Work around potential double row.delete() call

    The update_acls code can potentially iterate over the same ACL
    twice. This temporary workaround silently ignores an attempt to
    delete the same row twice in the same transaction, since that
    should be safe. Ultimately, refactoring the ACL code to use sets
    and possibly handle the fact that an ACL could be referenced from
    multiple rows should be done.

    Change-Id: I895eaf4006583fedc2657a4eb527df1ff992c5bc
    Related-bug: #1857016