Add a '-O' option to find only orphaned VLANs - VLANs that seem to belong to an experiment that no longer exists or is not swapped in.
Add a '-O' option to find only orphaned VLANs - VLANs that seem to
belong to an experiment that no longer exists or is not swapped in.

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