Fixed the tests from [8033] to work for the PostgreSQL backends (the primary

key value isn't guaranteed to be the same across all backends). Still some
breakage on MySQL because of the way it treats booleans, but that's another
issue.

Refs #6755.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8051 bcc190cf-cafb-0310-a4f2-bffc1f526a37