[1.1.X] Fixed an unspecified ordering in the expression tests that could lead to a heisenbug.

>>> c.save()

# F Expressions can also span joins

>>> Company.objects.filter(ceo__firstname=F('point_of_contact__firstname')).distinct()

>>> Company.objects.filter(ceo__firstname=F('point_of_contact__firstname')).distinct().order_by('name')

[<Company: Foobar Ltd.>, <Company: Test GmbH>]

>>> _ = Company.objects.exclude(ceo__firstname=F('point_of_contact__firstname')).update(name='foo')