dirty test hack /django RemoteUserMiddleware bug

https://code.djangoproject.com/ticket/13394

https://groups.google.com/d/msg/django-users/VpPrGVPS0aw/SwE8X51Q8jYJ
subclass RemoteUserBackend override configure_user

as per https://github.com/ucldc/avram/commit/c985d4b420635f5adf0cea13ec48b3f4ecfeed33