a failed modification of project quota shows an error & success at the same time

[Yogev Rabl]

the admin user try to edit the quota setting of a project:
changing the amount of instances from 10 to 4 when there are 5 instances active. The dashboard show an error balloon that says that it was unable to change the quotas & the a success balloon beneath it saying success modified project.

If there was an error the success balloon should not appear.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/74239

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/74239
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=b615a4e70dbd2688a5a9aa7d543a2e40599dda11
Submitter: Jenkins
Branch: master

commit b615a4e70dbd2688a5a9aa7d543a2e40599dda11
Author: Cindy Lu <email address hidden>
Date: Mon Feb 17 18:59:51 2014 -0800

    fix project quota showing error and success message

    right now if you try to change a quota value to something less than what is currently
    used, it will give you both error and success message
    fix test cases to check for 2 errors messages

    Change-Id: I25550346e553b1469b321cd46b2eeff612f11869
    Closes-Bug: #1278353