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This is gated behind the silent disco control knob, which is still in its infancy. Prior to this change disco pong reception was the only event that could move trustBestAddrUntil forward, so even though we weren't heartbeating, we would kick off discovery pings every trustUDPAddrDuration and mirror to DERP. Updates #540 Signed-off-by: Jordan Whited <jordan@tailscale.com>