Merge r1821624, r1821625, r1821626, r1821627, r1821629, r1821632, r1821635,...

Merge r1821624, r1821625, r1821626, r1821627, r1821629, r1821632, r1821635, r1821639, r1821644, r1821647, r1821648, r1821649, r1821650, r1821651, r1821659, r1821660, r1822366, r1822367, r1824381 from trunk:

Shared fdqueue code between MPMs event and worker into mpm_fdqueue.

This first step moves the files server/mpm/event/fdqueue.[ch] to
server/mpm_fdqueue.[ch] (untouched for now, simple svn move).

Will follow up with the necessary changes to mpm_unix.* for common code.


mpm_fdqueue: follow up to r1821624.

And now it's mpm_fdqueue, with minimal #includes.


mpm_fdqueue: follow up to r1821624.

Opacify fdqueue types.


mpm_fdqueue: follow up to r1821624.

Style, no functional change.


mpm_fdqueue: follow up to r1821624.

Rename ap_queue_info_get_idlers() to ap_queue_info_num_idlers().


mpm_fdqueue: follow up to r1821624.

Clear recycled_pools_count in ap_free_idle_pools().


mpm_fdqueue: follow up to r1821624.

Prepare mpm_worker to use common fdqueue.


mpm_worker: follow up to r1821624.

Use common...