Add timeout option for use with UDP mode; sets a timeout to quit waiting for a reply. I'm using this as part of the (30 minute hack) widearea node keepalive support.
Add timeout option for use with UDP mode; sets a timeout to quit
waiting for a reply. I'm using this as part of the (30 minute hack)
widearea node keepalive support.

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