Add the "watchdog" info command to configure timeouts for the client watchdog process based on sitevars.
Add the "watchdog" info command to configure timeouts for the client
watchdog process based on sitevars.

Also added a command flags field to take care of a couple of misc. attributes
like whether a command can be allowed from a remote site via UDP or whether
we should not perform as much logging.

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