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).