http: Fix LimitRequestBody checks when there is no more bytes to read.

Submitted by: Michael Kaufmann <mail michael-kaufmann.ch>
Committed by: ylavic
Reviewed  by: ylavic, mrumph, wrowe


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core: Allow spaces after chunk-size for compatibility with implementations
using a pre-filled buffer.

Proposed by: ylavic, trawick
Reviewed by: ylavic, wrowe, minfrin


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core: Fix chunk header parsing defect.
Remove apr_brigade_flatten(), buffering and duplicated code from
the HTTP_IN filter, parse chunks in a single pass with zero copy.
Limit accepted chunk-size to 2^63-1 and be strict about chunk-ext
authorized characters.

Submitted by: minfrin, ylavic
Reviewed by: ylavic, wrowe, minfrin
Reported by: regilero <regis.leroy makina-corpus.com>
Backports: 1484852, 1684513


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Bring SNI behavior into better conformance with RFC 6066:

- no longer send a warning-level unrecognized_name(112) alert
  when no matching vhost is found (PR 56241)

<not backported to 2.2.x>
- at startup, only issue warnings about IP/port conflicts and name-based
  SSL vhosts when running with an OpenSSL without TLS extension support
  (almost 5 years after SNI was added to 2.2.x, the
  "[...] only work for clients with TLS server name indication support"
  warning feels obsolete)
</not backported to 2.2.x>

Proposed by: kbrand
Reviewed by: ylavic, jorton, wrowe


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handler or input filter already did it while reading the request (causing
a double response body).

Submitted by: ylavic
Backports: r1482522 (partial, ap_map_http_request_error() things only!),
           r1529988, r1529991, r1643537, r1643543, r1657897, r1665625,
           r1665721, r1674056
Reviewed by: ylavic, wrowe, covener



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Backport of r1682923 and r1682937 from trunk,
resp. r1682929 and r1682939 from 2.4.x.


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