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
This adds new fields (currently unused) to discoInfo to track what the last verified (unambiguous) NodeKey a DiscoKey last mapped to, and when. Then on CallMeMaybe, Pong and on most Pings, we update the mapping from DiscoKey to the current NodeKey for that DiscoKey. Updates #3088 Change-Id: Idc4261972084dec71cf8ec7f9861fb9178eb0a4d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>