Provide a WSGI script for Apache to use to start up Keystone since Keystone
stopped shipping their own entrypoint. This is done in a way that users can
override it and the container has less moving pieces at startup.
Change-Id: Id32f8eb5bacea389d388d2483454d4a01ef608be
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>