Comment 2 for bug 1043381

Reviewed: https://review.openstack.org/12105
Committed: http://github.com/openstack/quantum/commit/19e553e1deeb8939decd1ed9554a3c6eb6770386
Submitter: Jenkins
Branch: master

commit 19e553e1deeb8939decd1ed9554a3c6eb6770386
Author: Yusuke Muraoka <email address hidden>
Date: Tue Aug 28 09:59:42 2012 +0000

    Plugin aware extensions should also be reset at each test setup

    PluginAwareExtensionManager caches extension according plugin.
    At each db plugin test setup, testing plugin and router are newly
    created.
    However, the extension manager held the extensions for first time
    loaded plugin. Because of their cache.

    So if a plugin conditional extension exists, it could not be loaded by
    testing order.

    Fixes bug 1043381.

    Change-Id: Ic994aab61c3d67aa9d422594484049f41ff8b321