Added VnameToNodeid(), a function to map a pid/eid/vname to a real nodeid.
Added VnameToNodeid(), a function to map a pid/eid/vname to a real
nodeid.

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