disco, wgengine/magicsock: send self node key in disco pings

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This lets clients quickly (sub-millisecond within a local LAN) map
from an ambiguous disco key to a node key without waiting for a
CallMeMaybe (over relatively high latency DERP).

Updates #3088

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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