[1.2.X] Fixed #14795 -- Ensure that get_all_permissions() returns the right...

[1.2.X] Fixed #14795 -- Ensure that get_all_permissions() returns the right result (i.e., all permissions) for superusers. Thanks to jay.halleaux@gmail.com for the report, and Brett Haydon for the patch.

Backport of r14797 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14801 bcc190cf-cafb-0310-a4f2-bffc1f526a37