Comment 6 for bug 1329559

Reviewed: https://review.openstack.org/100469
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2f40191d0efa783ca879338578097548ee8c84c0
Submitter: Jenkins
Branch: stable/icehouse

commit 2f40191d0efa783ca879338578097548ee8c84c0
Author: Joe Gordon <email address hidden>
Date: Thu Jun 12 16:27:07 2014 -0700

    Failure during termination should always leave state as error()

    Currently we have a situation where if an instance fails to delete,
    instead of having its state reverted, like we do in most places we set
    it to error,deleting. This was intentionally done in
    I5fb1bbd56035792f566a6e076edfe7a69df006ef. We also intentionally ignore
    duplicate requests to delete an instance if its already being deleted
    (I2f97f93bd714e0ea3b6d4fa3ac457ab43eed00e1). The combination of these two
    things means that if an instance fails to delete for some reason a
    tenant is unable to delete that instance.

    It turns out this is really bad because instances in deleting state
    count against quota, so the tenant slowly looses usable quota.

    To fix this, upon a failed termination set the vm_state to error and
    revert the task_state. This is a partial revert of
    I55742203bdd071c7df90902868e46c2020f799bd.

    Change-Id: I55742203bdd071c7df90902868e46c2020f799bd
    Closes-Bug: #1329559
    (cherry picked from commit f33a25a3c40722644c774395b38fd7a7ed0246e1)