Comment 4 for bug 1248799

Reviewed: https://review.openstack.org/58086
Committed: http://github.com/openstack/nova/commit/c8ded6429616b798947072a62cb1b5ee4ea51209
Submitter: Jenkins
Branch: master

commit c8ded6429616b798947072a62cb1b5ee4ea51209
Author: Jay Lau <email address hidden>
Date: Tue Nov 26 05:55:10 2013 +0800

    instance state will be stuck in unshelving when unshelve fails

    When unshelve an instance, if this instance has been offloaded,
    the conductor manager will involve re-schedule for the instance.
    If re-schedule failed to find a target host for the unsleved
    instance, then the instance will be stuck in unshelving state.

    This patch fix the issue as this: If re-schedule failed to find a
    target host for unshelve the instance, then conductor manager will
    try to rollback the instance to unshelve state.

    Change-Id: If49b2d2c9263b853c745ce25fe146ade51948123
    Closes-Bug: #1248799