Common DB supports lacks database cleanup

[Gary Kotton]

This is used by Quantum to try and reduce the memory footprint

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/27322

[aeva black (tenbrae)]

Could you explain / give an example of how the associated patch reduces the memory footprint? How often are you closing and reopening the db connection? Have you seen memory leaking out of sqlalchemy?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/27322
Committed: http://github.com/openstack/oslo-incubator/commit/e79811464cdab63b12e140d4d7a9ec650ddcc3e0
Submitter: Jenkins
Branch: master

commit e79811464cdab63b12e140d4d7a9ec650ddcc3e0
Author: Gary Kotton <email address hidden>
Date: Mon Apr 22 08:12:38 2013 +0000

    Add support to clear DB

    Fixes bug 1171740

    The method cleanup() can be called when a test is complete,
    for example in the tearDown method.

    Change-Id: Id30bcb0d7ef167f6cb3b1bdea06f6421e1234a86