Add new watchdog script, derived from the ron version (and will
replace it eventually). Like the ron nodes, local nodes will now periodically (once every 5 minutes) send a udp packet to boss to indicate the node is alive and to see if it needs to check for account updates. This will replace the once every 5 minute fping we do from db/node_status (once I whack that script), and will simplify the existing problem of propogating accounts to nodes (nodes down, nodes in the swapping phase, etc).
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