Comment 4 for bug 1691615

Reviewed: https://review.openstack.org/465794
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=97e3cb891abd685e2dcb187deb34202a4ed251b2
Submitter: Jenkins
Branch: master

commit 97e3cb891abd685e2dcb187deb34202a4ed251b2
Author: Matt Riedemann <email address hidden>
Date: Tue Aug 1 09:05:30 2017 -0400

    Don't warn on expected network-vif-unplugged events

    If we're getting a network-vif-unplugged event because we're
    deleting an instance, and part of that is unplugging vifs,
    then we don't need to log a warning about it since it's expected.

    This could be true of other tasks like migrations, but we're
    starting small here. So for now, if we log a warning, this change
    also includes the vm_state and task_state in the warning to help
    us discover what else we can expect.

    Change-Id: I080075fa543bd1ca4fa57580583bda6d3847bf9c
    Closes-Bug: #1691615