Fixed #18038 -- Removed the 'supports_inactive_user' backwards-compatibility...

Fixed #18038 -- Removed the 'supports_inactive_user' backwards-compatibility flag. Thanks Aymeric Augustin for the initial patch and Ramiro Morales for the review.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@17938 bcc190cf-cafb-0310-a4f2-bffc1f526a37