This is really just a stop-gap until we come up with a improved way of handling
disparate auth data, but it should help us stretch a bit more milage out of the
current system.

Thanks to alextreme, lbruno, and clayg.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12634 bcc190cf-cafb-0310-a4f2-bffc1f526a37