Revert "Leigh's changes for DHCP on vnode hosts."
Revert "Leigh's changes for DHCP on vnode hosts."

This reverts commit bb06a279b5e49577973a10facb592edce09ce794.

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