Comment 7 for bug 973393

Reviewed: https://review.openstack.org/22873
Committed: http://github.com/openstack/nova/commit/20294279ee1d6d82dbb87c4c29e3a8b9fd0cb8bd
Submitter: Jenkins
Branch: stable/folsom

commit 20294279ee1d6d82dbb87c4c29e3a8b9fd0cb8bd
Author: Jian Wen <email address hidden>
Date: Mon Jan 14 19:13:24 2013 +0800

    Handle compute node not available for live migration

    This patch handles exception.ComputeServiceUnavailable by restoring
    instance's vm_state and instance's task_state after live migration
    failure caused by unavailable source/dest compute node.

    Raises detailed HTTPBadRequest explanation for this exception.

    Fixes bug 973393 and bug 1051881

    Conflicts:
     nova/scheduler/driver.py
     nova/scheduler/manager.py
     nova/tests/api/openstack/compute/contrib/test_admin_actions.py
     nova/tests/scheduler/test_scheduler.py

    Change-Id: If825b61fad9c4e3030f2e6c5002907255eaf3661