
This patch merely address the Swift cache backward compatibility support. There's another BP which address the elephant-in-the-room, which is unified and consistent caching mechanism for all middleware. See https://blueprints.launchpad.net/keystone/+spec/unifed-caching-system-for-middleware Change-Id: Iab6b4ac61c9aa9e7ad32a394557cb7558bd60a43