Improve ICE reliability.
Improve ICE reliability.

* Fix a bug which stopped sending probes much sooner that configured expiration.

* Send/receive more than one confirmation probe after the circuit was chosen. This should improve reliability.

* Wait 4 seconds (so we have 8 retries) before making a decision on the initiator. After all, allow 2 seconds (4 tries) to confirm the chosen circuti.

* Improve debugging with more meaningful and complete messages in verbose mode.

* Document configurable items (and delete one which had little meaning).

chripell/nat