greenwave: add Samba AD tests to update gating policy
    
    These have been running stably for some time now, so it should
    be OK to gate on them. I have checked through old stuck updates
    and unblocked any that would be gated on this, remaining ones
    aren't gated on the server tests.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>