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A DiscoKey maps 1:n to endpoints. When we get a disco pong, we don't necessarily know which endpoint sent it to us. Ask them all. There will only usually be 1 (and in rare circumstances 2). So it's easier to ask all two rather than building new maps from the random ping TxID to its endpoint. Updates #3088 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> (cherry picked from commit 04fd94acd6f764ba7b8e96b9aa9cae5e28ae3b85)