Brad Fitzpatrick 275a20f817 wgengine/magicsock: keep discoOfAddr populated, use it for findEndpoint
Update the mapping from ip:port to discokey, so when we retrieve a
packet from the network, we can find the same conn.Endpoint that we
gave to wireguard-go previously, without making it think we've
roamed. (We did, but we're not using its roaming.)

Updates #483
2020-07-01 22:15:41 -07:00
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