fence_rhevm: Incorrect status detected when VM is not in up/down
    
    For fencing purposes we have to focus on getting OFF status
    when machine is really 100% down, conditions for ON status are much simplier
    (as fact that machine is has power does not mean that it works). This patch
    specify condition for OFF status - in fact only 'Down' is accepted now
    
    Resolves: rhbz#786485