shorter ping interval a few seconds after a neighbor gets idle, more accurate latency...

shorter ping interval a few seconds after a neighbor gets idle, more accurate latency measurements, do not loose ping if kpackets are sent via qos, do not send duplicate reset/unknown_connid commands, retransmit BUG_ON fix, databuf size limit, unreserve_sock_buffer moved to wake_sender, reset_timeouted_conns fix, is_from_neigh+find_neigh finer locking, reset conns reliably and with low priority if a neighbor goes offline, kill eighbors immediately when the interface goes down, reduce speedtracker reaction time