Added a reference to the mpm-event's doc about the fact that it does not require any mpm-accept mutex set.

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mod_http2: fixes connection shutdown and updates log tags


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(and adjust version info in CHANGES, ap_mmn comment, core.xml)

core: New CGIVar directive can configure REQUEST_URI to represent the
current URI being processed instead of always the original request.

Submitted by: trawick
Reviewed by: ylavic, jim


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scoreboard/status: Keep previous worker connection/request data when idle as
prior to 2.4.20.


scoreboard/status: follow up to r1739008.
Restore (completely) pre-2.4.20 behaviour w.r.t. preserved values.
r1739008 was still unnessessarily blanking some values for the time of
BUSY_READ -> BUSY_WRITE (with blocking MPMs).


scoreboard/status: follow up to 1739146.
Comment not needed anymore...


Clarify CHANGES entry, including the correct version for the
restored behaviour.

Submitted by: ylavic
Reviewed/backported by: jim


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  Replace nonsense statement in the backport proposal (the backport has
  merit, but for an altogether different reason).

  http2-wg has no impact on HTTP/1.1 protocol, and Upgrade: request and
  response in this case is defined by the HTTP/1.1 RFC, alone.  An Upgrade
  header in an HTTP/2.0 stream is entirely under the scope of HTTP/2.0 RFC.



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Fix link to distcache. 
http://www.distcache.org/ --> http://distcache.sourceforge.net/

(r1740717 in trunk)

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mod_http2: disabling mmap on file buckets, changing r->protocol to HTTP/2.0


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