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This is the first, and easier, part of incremental wireguard-go reconfiguration. It means that a new node appearing on the network does not cause all existing nodes to re-handshake with the other nodes they are talking to. (This code has been running on hello.ipn.dev for a few weeks and peers have successfully reconnected to it through many network map updates.) Signed-off-by: David Crawshaw <crawshaw@tailscale.com>