Comment 4 for bug 1812969

Reviewed: https://review.openstack.org/636954
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1a684f6fbef941de88556ec023860ab532938d88
Submitter: Zuul
Branch: stable/rocky

commit 1a684f6fbef941de88556ec023860ab532938d88
Author: yenai <email address hidden>
Date: Wed Jan 23 13:54:47 2019 +0800

    Ignore VolumeAttachmentNotFound exception in compute.manager

    DriverVolumeBlockDevice will delete volume attachment when attach
    fails, codes link:
    https://github.com/openstack/nova/blob/907c7d2cf/nova/virt/block_device.py#L561-L568
    However, nova.compute.manager will delete it again and it will raise
    VolumeAttachmentNotFound exception. This outputs an incorrect error
    log and this exception should be ignored.

    Change-Id: I939c09e5b0efb3b17a9855af227e6d60c64d23e2
    Closes-Bug: #1812969
    (cherry picked from commit 595866eb62db56fbd4f965619031ac902f99441a)