[1.0.X] Fixed #10747: fixed the auth tests to ignore broken user-supplied...

[1.0.X] Fixed #10747: fixed the auth tests to ignore broken user-supplied login/logout templates. Backport of r10482 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10483 bcc190cf-cafb-0310-a4f2-bffc1f526a37