Comment 7 for bug 1439518

Reviewed: https://review.openstack.org/224960
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=d76094c9d663fff479e7d959920420fb23cfd0d2
Submitter: Jenkins
Branch: stable/kilo

commit d76094c9d663fff479e7d959920420fb23cfd0d2
Author: Randall Burt <email address hidden>
Date: Mon Jul 13 18:35:09 2015 -0500

    Refactor and correct purge_deleted

    This method had not been updated in a while
    to account for changes in the db schema. Also,
    it was refactored to use bulk delete statements
    rather than iteration as the iteration approach
    ran quite a long time and consumed quite a bit
    of resources.

    Change-Id: Ia49e801d3c244a1fabb8441e7eaa22b88e5fcb56
    Closes-Bug: #1439518
    (cherry picked from commit d3def2acee7e836263319bd64471816cf1de2540)