Comment 5 for bug 1634773

Reviewed: https://review.openstack.org/409715
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=0080a12361b480f5b87ebdb62285b4100550d0b1
Submitter: Jenkins
Branch: stable/newton

commit 0080a12361b480f5b87ebdb62285b4100550d0b1
Author: bhagyashris <email address hidden>
Date: Mon Oct 17 19:29:21 2016 +0530

    Handle ImageNotFound exception during instance backup

    If user have already backed up instance to few numbers and then
    execute backup api with rotation 1, then nova will delete the
    previously created images exceeding rotation limit.
    During deleting these images, if user mistakenly deletes one of the
    image in advance, then backup instance won't be able to delete all
    images exceeding rotation limit causing api failure.

    This patch handles ImageNotFound exception during deleting backup
    images, logs a warning message and continues deleting all of the
    remaining images.

    Closes-Bug: #1634773
    Change-Id: Ib999138ddbbcd62e0c99a69e5c6d37b4e49f871f
    (cherry picked from commit cc5d3437cabab4688df8492e071ea8c597311113)