If HUP/INT/TERM'ed, make sure we kill off child frisbee and remove any partial image.
If HUP/INT/TERM'ed, make sure we kill off child frisbee and remove any
partial image.

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