conncheck: rework the stun requests ordering per timer tick
With this patch, we merge the two variables stun_sent and keep_timer_going. The three functions that are a possible source of a new stun request returns a boolean value stating if a request has been sent. The semantic of keep_timer_going can now be deduced from stun_sent and from the result of priv_conn_check_stream_nominate(). The trick that makes this merge possible is to repurpose the return value of priv_conn_check_tick_stream(), because keep_timer_going set when the conncheck list contains in-progress pairs in this function is redundant with the same check later in function priv_conn_check_tick_stream_nominate().
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