Silence comparison-with-itself in tests
    
    Test code performs comparison to itself in order to verify __eq__ and
    __ne__ implementations.
    
    See: https://pagure.io/freeipa/issue/7758
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>