Sort the LANs and nodes before we put them into the topo file, so that two identical topologies always produce identical topofiles.
Sort the LANs and nodes before we put them into the topo file, so
that two identical topologies always produce identical topofiles.

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