We log it once upon receiving the first copy of the map, then
subsequently when a new one appears, but only if we haven't logged one
less than 5 minutes ago.
This avoids overly cluttering the log (as we did before, logging the
netmap every time one appeared, which could be hundreds of lines every
few seconds), but still gives the log enough context to help in
diagnosing problems retroactively.
* 'master' of github.com:tailscale/tailscale:
netcheck: fix data races for staggler STUN packets arriving after GetReport
wgengine/magicsock: add a pointer value for logging
netcheck: ignore IPv4 STUN failures if we saw at least one reply
netcheck: ignore IPv6 STUN failures
derp: add clients_replaced counter
version: bump OSS version datestamp.
relaynode itself is not long for this world, deprecated in favour of
tailscale/tailscaled. But now that the control server supports central
distribution of packet filters, let's actually take advantage of it in
a final, backward compatible release of relaynode.
Avery Pennarun