Add a generic NOMAPPING error code to tell the caller that the topology could not be mapped to physical resources. Useful at the portal for controlling what errors get reported to tbops.
Add a generic NOMAPPING error code to tell the caller that the topology
could not be mapped to physical resources. Useful at the portal for
controlling what errors get reported to tbops.

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