Uplift of relevante changes of r1855479 in branches/2.4.x, re disappearance of h2_ngn_shed.* sources.


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mod_mime: Add `MimeOptions` directive to allow Content-Type or all metadata
detection to use only the last (right-most) file extension. 



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maintainer-mode for later versions of clang module compile specific
(we will still SEE the errors though when buidlin)


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No error here, just debug information.


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Implies a Major bump.


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We need not remember each child's bucket number in SHM for restarts, for the
lifetime of the httpd main process the bucket number can be bound to the slot
number such that: bucket = slot % num_buckets.

This both simplifies the logic and helps children maintenance per bucket in
threaded MPMs, where previously perform_idle_server_maintenance() could create
or kill children processes for the buckets it was not in charge of.


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     in play, the proper HTTP/2 stream reset did not trigger with H2_ERR_HTTP_1_1_REQUIRED.
     Fixed. [Michael Kaufmann] 



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     padding of HTTP/2 payload frames. 'numbits' is a number from 0-8,
     controlling the range of padding bytes added to a frame. The actual number
     added is chosen randomly per frame. This applies to HEADERS, DATA and PUSH_PROMISE
     frames equally. The default continues to be 0, e.g. no padding. [Stefan Eissing] 
  
  *) mod_http2: ripping out all the h2_req_engine internal features now that mod_proxy_http2
     has no more need for it. Optional functions are still declared but no longer implemented.
     While previous mod_proxy_http2 will work with this, it is recommeneded to run the matching
     versions of both modules. [Stefan Eissing]
  
  *) mod_proxy_http2: changed mod_proxy_http2 implementation and fixed several bugs which
     resolve PR63170. The proxy module does now a single h2 request on the (reused)
     connection and returns. [Stefan Eissing]



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The error is: "filter-expr(funcall(current, []), [pred(=(step("attribute", 39), literal-expr(section)))])'. Cause: Erreur lors de la vérification du type de l'expression 'filter-expr(funcall(current, []), [pred(=(step("attribute", 39), literal-expr(section)))])"

This takes us 1 step closer to use Ant 1.9+ and remove Xerces and Xalan from the build chain.


Patch tested with the current doc build chain (Ant 1.6.5 + Xerces + Xalan) on the 2.4.x branch.
Even if actually we don't have any "<Foo>" and "Foo" directives, I've checked that the doc is built correctly in such a case.

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     to trigger immediate shutdown of backend connections. This is now always signalled
     by mod_http2 when the the session is being released. 
     proxy_http2 now only sends a PING frame to the backend when there is not already one
     in flight. [Stefan Eissing]

  *) mod_proxy_http2: fixed an issue where a proxy_http2 handler entered an infinite 
     loop when encountering certain errors on the backend connection. 
     See <https://bz.apache.org/bugzilla/show_bug.cgi?id=63170>. [Stefan Eissing]



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Don't eat the EOS in ap_http_header_filter() if it comes in single brigade
with a full response to a HEAD request, otherwise mod_ratelimit will never
flush its pending data.


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cryptographic 

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This is way too verbose (every 100ms) to be logged at any LogLevel.


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No, if we read more bytes than the C-L there is really something wrong in
our (or some) HTTP input filter.


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Since stream_reqbody_cl() and stream_reqbody_chunked}() now have the same
structure, join them into a single stream_reqbody() function which is passed
the rb_method to handle only CL vs chunked cases differently.


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It helps both code readability where stages are initilized and potential
logging in the output filter (even if the stage is disabled).


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The timeouts apply between the process_connection and pre_read_request hooks.
They are disabled by default for compatibily reasons.


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With a bit of macro magic, this is to avoid more code duplication when adding
new stages (next commit will add TLS/handshake timeouts handling in addition to
existing header and body ones).

No functional change here.


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Below some threshold, the previous code tried free (sub-)pooled memory ASAP by
moving small buffers (< capacity / 2) to a heap bucket. But this is not really
an optimization because first it requires at some point to allocate more than
the configured capacity, and second since this happens during response handling
the pool is about to be destroyed soon anymay.

This commit simply keeps the data in the subpool and uses a pool bucket for the
output brigade to take care of the lifetime until it's consumed (or not).


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- Be consistent with the case used for AuthLDAPURL. Use uppercase URL, as in the code in order to fix syntax highlight issues.
- Fix the case of AuthLDAPSubGroupAttribute in <default>, so that quickreference.xsl works as expected

Fix some other small layout issues.

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