Comment 6 for bug 1721670

Reviewed: https://review.openstack.org/511325
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=d7a60f8a1c51070237590d975b1acc61f4bbcfca
Submitter: Zuul
Branch: stable/ocata

commit d7a60f8a1c51070237590d975b1acc61f4bbcfca
Author: melanie witt <email address hidden>
Date: Thu Oct 5 23:55:58 2017 +0000

    Target context for build notification in conductor

    When sending notifications about an instance, it's possible the
    notification payload will have attributes not already loaded on
    the instance. In this case, a lazy-load will happen and if the
    load method needs to lookup the instance (example: in the
    _check_instance_exists_in_project method in the DB layer), the
    InstanceNotFound exception will be raised and the notification
    will fail to be sent.

    This targets the instance context to the instance's cell when
    calling the send notification method.

    Closes-Bug: #1721670

     Conflicts:
     nova/conductor/manager.py
     nova/tests/unit/conductor/test_conductor.py

    NOTE(melwitt): Conflict was due to the older version of target_cell
    not yielding a new RequestContext, the absence of set_target_cell,
    and an older version of the unit test in Ocata.

    Change-Id: I6b9eb120b6e7fcbf919a3791afe2d1f6a7bd3b60
    (cherry picked from commit 54cf9f5a90d745896d133669e6d1260e6adee51b)