[1.3.X] Fixes #15975 -- Test failure in model validation tests due to us now...

[1.3.X] Fixes #15975 -- Test failure in model validation tests due to us now having https://www.djangoproject.com

Backport of r16163 from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16164 bcc190cf-cafb-0310-a4f2-bffc1f526a37