Exra check. Make sure we don't remove a VLAN unless we suceeded in removing all of the ports in it.
Exra check. Make sure we don't remove a VLAN unless we suceeded in
removing all of the ports in it.

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