Brad Fitzpatrick 6b80bcf112 derp: remove a client round-trip waiting on serverInfo
It just has a version number in it and it's not really needed.
Instead just return it as a normal Recv message type for those
that care (currently only tests).

Updates #150 (in that it shares the same goal: initial DERP latency)
Updates #199 (in that it removes some DERP versioning)
2020-08-17 16:15:22 -07:00
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