Remove DL0 specific tests from ipatests/test_integration/test_replica_promotion.py
    
    These tests have been skipped already before. Therefore they can be removed.
    
    See: https://pagure.io/freeipa/issue/7689
    Signed-off-by: Thomas Woerner <twoerner@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>