[taskflow] Quotas are not rolled back on failure of create volume

[Rohit Karajgi]

Commit: 1874d913ecbf8f09809992c98496365327905211

After the QuotaCommitTask commits the reserved quotas, and a failure occurs at a subsequent Task,
the revert method of the QuotaReserveTask gets called, and completes, however the quotas don't actually get rolled back.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/49103

[John Griffith (john-griffith)]

Abhijeet,

Assigned back to you, it was your work and your fix. I just didn't have a way to get ahold of you and it needed a rebase so I did a simple rebase and reposted.

Thanks for taking care of this!

John

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/49103
Committed: http://github.com/openstack/cinder/commit/d7623249847010edd2b97085506064da0b642d8d
Submitter: Jenkins
Branch: master

commit d7623249847010edd2b97085506064da0b642d8d
Author: Abhijeet Malawade <email address hidden>
Date: Fri Sep 27 05:13:52 2013 -0700

    Quotas roll back failure of create volume task

    Fixes quotas rollback issue if volume creation fails

    * Added revert method in QuotaCommitTask to rollback
    * volume reservations.

    Fixes bug #1230176

    Change-Id: I0983ea876983b4294ed0aebb49a065715a185b4e