Comment 4 for bug 1245360

Reviewed: https://review.openstack.org/64081
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=07892b1738cae49b709cbb7e4657dd29751d8c6d
Submitter: Jenkins
Branch: stable/havana

commit 07892b1738cae49b709cbb7e4657dd29751d8c6d
Author: ling-yun <email address hidden>
Date: Mon Oct 28 15:38:35 2013 +0800

    Add valid check and unit tests on quota class

    1.Cinder quota class hard_limit’s value should larger than -1 (-1 is a flag
    value for unlimited).
    2.Add unit tests for quota class.
    3.Add quota_classes extension enabled in unitest, so as to do
    unitest for quota_classes' update operation.

    Closes-bug: #1245360

    Change-Id: Ie483db1bdbd4fac875de26abab8ebebd96f4938b
    (cherry picked from commit 8b6d51ea04a65d846b0e92a11e191327360d7427)