Add a sanity check to see if someone's experiment uses more VLANs than we can physically make on the switches.
Add a sanity check to see if someone's experiment uses more VLANs
than we can physically make on the switches.

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