Inside a XEN vm, we want to halt instead of reboot, since otherwise we just keep going and going and going.
Inside a XEN vm, we want to halt instead of reboot, since
otherwise we just keep going and going and going.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome