Bug fix for updating a sliver or ticket that includes VMs. Since we now put the actual VM names into the component_urn, must map back to the physical host since that is how the mapper operates.
Bug fix for updating a sliver or ticket that includes VMs. Since we
now put the actual VM names into the component_urn, must map back to
the physical host since that is how the mapper operates.

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