Comment 4 for bug 1611321

Reviewed: https://review.openstack.org/352837
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=c7af24ca8279226adc5cd8fa0984c6fd79e26d67
Submitter: Jenkins
Branch: master

commit c7af24ca8279226adc5cd8fa0984c6fd79e26d67
Author: Lucian Petrut <email address hidden>
Date: Tue Aug 9 13:21:48 2016 +0300

    HyperV: remove instance snapshot lock

    At the moment, the instance snapshot operation is synchronized using
    the instance uuid. This was added some time ago, as the instance
    destroy operation was failing when an instance snapshot was in
    proggress.

    This is now causing a deadlock, as a similar lock was recently
    introduced in the manager for the shelve operation by this change:
    Id36b3b9516d72d28519c18c38d98b646b47d288d

    We can safely remove the lock from the HyperV driver as we now stop
    pending jobs when destroying instances.

    Closes-Bug: #1611321

    Change-Id: I1c2ca0d24c195ebaba442bbb7091dcecc0a7e781