Revert "MEDIUM: queue: simplify again the process_srv_queue() API"

This reverts commit c83e45e9b001591633188a480a896c935d3c9625.

The recent changes since 5304669e1 MEDIUM: queue: make
pendconn_process_next_strm() only return the pendconn opened a tiny race
condition between stream_free() and process_srv_queue(), as the pendconn
is accessed outside of the lock, possibly while it's being freed. A
different approach is required.
7 files changed