Ignore isalive from local nodes. The new image will run a watchdog
like the remote nodes do, but for now do not update the up/down status from that. I need to mess with db/node_status first to make sure there is agreement between the parties. Note that remote nodes send one UDP message every 60 seconds (isalive is done with a UDP). Local nodes will send them at a slower rate, as is the practice in db/node_status which wakes up every 5 minutes and fpings the world!
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