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When pruning pending checks (after at least one nominated pair has been obtained), some supplementary cases need to be handled, to ensure that the property "all pairs and only the pairs having a higher priority than the nominated pair should have the stun retransmit flag set" remains true during the whole conncheck: - a pair "not to be retransmitted" must be removed from the triggered check list (because a triggered check would create a new stun request, that would defacto ignore the retransmit flag) - an in-progress pair "not to be retransmitted", for which no stun request has been sent (p->stun_transactions == NULL, a transient state) must be removed from the conncheck list, just like a waiting pair. - a failed pair must have its flag "retransmit" updated too, just like another pair, since a failed pair could match an inbound check, and generate a triggered check, based on retransmit flag value : ie only if this pair has a chance to become a better nominated pair. See NICE_CHECK_FAILED case in priv_schedule_triggered_check().
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