- Try to pick better introducers by checking shitlist,
wasUnreachable list, failing list, and idle times
- To keep introducer connections up and valid,
periodically send a "ping" (a data packet with no data and no acks)
to everybody that has been an introducer in the last two hours
- Add a stat udp.receiveRelayRequestBadTag, make udp.receiveRelayRequest only for good ones
- Remove some 60s and 5m stats, leave only the 10m ones
- Narrow the range for the retransmit time after an allocation fail
- Adjust some logging