Comment 4 for bug 1319797

Reviewed: https://review.openstack.org/101832
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1469c8e14267e27ecc6ced29c91dc1506ce26633
Submitter: Jenkins
Branch: stable/icehouse

commit 1469c8e14267e27ecc6ced29c91dc1506ce26633
Author: David McNally <email address hidden>
Date: Fri May 16 13:21:26 2014 +0100

    Prevent clean-up of migrating instances on compute init

    During compute manager startup init_host is called. One
    of the functions this carries out is to delete instance
    data that doesn't belong to this host this function only
    checks if the local instance belongs to the host or not.
    It doesn't check the task_state. This could result in the
    loss of all instance data if it occured at the wrong
    point during live migration.

    This change checks if the task_state of the instance to
    be deleted is MIGRATING and if so it does not delete the
    instance. Similarily for the task state RESIZE_MIGRATING.

    This change adjust little about the unit test according to
    actual code path in icehouse.
    Conflicts:
     nova/tests/compute/test_compute_mgr.py

    Change-Id: Ia8c67acf93d71af868907f0711dcc1dfe103560c
    Closes-Bug: 1319797
    (cherry picked from commit 340cae5466eaf5568c4f0eecb2a2fa7cdbcc0ba4)