Tweaks to the arpinfo code.
Tweaks to the arpinfo code.

Most sites don't have boss/ops/fs in the DB, so we use sitevariables to
get their IP/MAC instead. Also now pass the type of "arp lockdown" we are
doing (none, static, staticonly).

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