Comment 22 for bug 1744361

Reviewed: https://review.openstack.org/542738
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=5a10047f9dd4383f6ec9046d392f26c93f8420d4
Submitter: Zuul
Branch: stable/queens

commit 5a10047f9dd4383f6ec9046d392f26c93f8420d4
Author: melanie witt <email address hidden>
Date: Tue Feb 6 20:32:33 2018 +0000

    Refine waiting for vif plug events during _hard_reboot

    In change Ib0cf5d55750f13d0499a570f14024dca551ed4d4, we stopped waiting
    for vif plug events during hard reboot and start, because the behavior
    of neutron plug events depended on the vif type and we couldn't rely on
    the stale network info cache.

    This refines the logic not to wait for vif plug events only for the
    bridge vif type, instead of for all types. We also add a flag to
    _create_domain_and_network to indicate that we're in the middle of a
    reboot and to expect to wait for plug events for all vif types except
    the bridge vif type, regardless of the vif's 'active' status.

    We only query network_info from neutron at the beginning of a reboot,
    before we've unplugged anything, so the majority of the time, the vifs
    will be active=True. The current logic in get_neutron_events will only
    expect events for vifs with 'active' status False. This adds a way to
    override that if we know we've already unplugged vifs as part of a
    reboot.

    Related-Bug: #1744361

    Change-Id: Ib08afad3822f2ca95cfeea18d7f4fc4cb407b4d6
    (cherry picked from commit aaf37a26d6caa124f0cc6c3fe21bfdf58ccb8517)