[1.0.X] Ensure Django's test suite is included when we build release packages....

[1.0.X] Ensure Django's test suite is included when we build release packages. Backport of [10230] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10231 bcc190cf-cafb-0310-a4f2-bffc1f526a37