Review default timer usage

Default timer shall be used just up to confirmation or response in case of rcode != 0 (e.g. error nadr - unbonded node). After confirmation evaluated timeout shall be used or user one if it is longer.

In case of nadr == 0 - shall we use default or user?

In case of DISCOVERY nadr == 0 - use user What about BONDED nadr == 0 - user as for DISCOVERY?