Better handling for tunnels that span aggregates.
Better handling for tunnels that span aggregates.

Be sure to added the other side of the tunnel to the topomap, when the
tunnel spans aggregates, so that the host/route calculators on the
client do the right thing.

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