Fix bug with links that use vinterfaces; Be sure to get the IP from the vinterface instead of the interface.
Fix bug with links that use vinterfaces; Be sure to get the IP from
the vinterface instead of the interface.

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