Silence a spurious warning (don't complain about interswitch links when all links are intraswitch).
Silence a spurious warning (don't complain about interswitch links
when all links are intraswitch).

Also, if the warning really DOES apply, send it to standard error instead.

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