Lift some of Jon's code from ipassign_wrapper for computing link/lan equivalence in the presence of bridge nodes.
Lift some of Jon's code from ipassign_wrapper for computing link/lan
equivalence in the presence of bridge nodes.

Use that to spit out proper topomap so the clients can do distributed
route calculation.

Add some code that is not enabled (and not working) for linktest in
the presence of bridge nodes. This is is really a pain and I have not
figured it out yet.

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