Add named variables to rc.conf to force wait til "boss.emulab.net" resolves.
Add named variables to rc.conf to force wait til "boss.emulab.net" resolves.

An inner control net for which we fix the speed, apparently takes longer
to come ready, causing early rc.d scripts like ntpd and mfrisbeed to fail
because they cannot reach boss.emulab.net to resolve names. These standard
variables tell the rc.d/named script to not return until it can resolve
boss.emulab.net, thus preventing the other scripts from running til then.

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