Fixed the tests from [9438] to work consistantly across databases. In...

Fixed the tests from [9438] to work consistantly across databases. In particular, it was failing on newer versions of PostgreSQL after [10586].

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10626 bcc190cf-cafb-0310-a4f2-bffc1f526a37