Comment 20 for bug 1831771

Reviewed: https://review.opendev.org/715406
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=f50bd6e65758c7c3f3b433a1e66bd8c94f6947f8
Submitter: Zuul
Branch: stable/queens

commit f50bd6e65758c7c3f3b433a1e66bd8c94f6947f8
Author: Stephen Finucane <email address hidden>
Date: Wed Jun 5 16:39:45 2019 +0100

    Unplug VIFs as part of cleanup of networks

    If an instance fails to build, which is possible for a variety of
    reasons, we may end up in a situation where we have remnants of a
    plugged VIF (typically files) left on the host. This is because we
    cleanup from the neutron perspective but don't attempt to unplug the
    VIF, a call which may have many side-effects depending on the VIF
    driver. Resolve this by always attempting to unplug VIFs as part of the
    network cleanup.

    A now invalid note is also removed and a unit test corrected.

    Conflicts:
     nova/tests/unit/compute/test_compute_mgr.py

    NOTE(stephenfin): Conflict is because we're missing change
    Ic5cab99944df9e501ba2032eb96911c36304494d ("Port binding based on events
    during live migration") which we don't want to backport.

    Closes-Bug: #1831771
    Related-Bug: #1830081
    Signed-off-by: Stephen Finucane <email address hidden>
    Change-Id: Ibdbde4ed460a99b0cbe0d6b76e0e5b3c0650f9d9
    (cherry picked from commit b3e14931d6aac6ee5776ce1e6974c75a5a6b1823)
    (cherry picked from commit 3e935325a88bf7a0206ec07bc67383e8be846f15)
    (cherry picked from commit 265fd4f6bd56c711d7827c2defc993e19a541770)
    (cherry picked from commit 85521691a843b9606d4a8aa050f4452ba025eb02)