Disable DL0 specific tests
    
    Disable tests that use domain level 0. Fail early to catch additional
    tests that depend on DL0.
    
    See: https://pagure.io/freeipa/issue/7669
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Thomas Woerner <twoerner@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>