If the user does not specify a sync server, do it for them by picking the first node in the list. Useful for the linktest stuff, and the sync server is harmless.
If the user does not specify a sync server, do it for them by picking
the first node in the list. Useful for the linktest stuff, and the
sync server is harmless.

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