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Reworked and added examples to the HTTPProtocolOptions doc

On #httpd-dev a user gave us some hints about what kind of
things would have been great to see in the HTTPProtocolOptions
directive's documentation, so I tried to apply them all.

I also added some examples taken from http_strict.t and tested
a bit. I didn't follow completely the complete change-set of
the HTTPProtocolOptions directive, so please review the change
and let me know if anything is wrong or missing.


Submitted by: elukey


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Added more details to mod-proxy-http2's doc

Reworked mod-proxy-http2's documentation after Stefan's suggestions

Submitted by: elukey


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Merge r1779743,1779896,1779972 from trunk.

mod_http2: fixes PR60599, sending proper response for conditional requests
answered by mod_cache. [Jeff Wheelhouse, Stefan Eissing]



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  *) mod_http2: rework of stream resource cleanup to avoid a crash in a close
     of a lingering connection. Prohibit special file bucket beaming for
     shared buckets. Files sent in stream output now use the stream pool
     as read buffer, reducing memory footprint of connections.
     [Yann Ylavic, Stefan Eissing]
     



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the -R option has been gone for ages.


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  *) mod_http2: streaming of request output now reacts timely to data
     from other streams becoming available. Same for new incoming requests.
 


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http: allow folding in check_headers(), still compliant with RFC 7230 (3.2.4).


http: follow up to r1777460.
We MUST unfold outgoing HTTP headers in any case, "message/http" is for
inner content.
Submitted by: ylavic
Reviewed by: ylavic, covener, wrowe


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      once-per-restart msg (I guess the concern was that the RNG
          could block after this message)
                AH01757: generating secret for digest authentication ...
                    trunk patch: This was fixed in trunk as a trivial part of http://svn.apache.org/r1492395
                        2.4.x patch: Just change the loglevel to DEBUG.
                            +1: covener, jim, wrowe



Submitted by: covener
Reviewed by: covener, jim, wrowe


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fix crash in util_fcgi.c

 *) mod_proxy_fcgi, mod_fcgid: Fix crashes in ap_fcgi_encoded_env_len() when
    modules add empty environment variables to the request. PR60275.
    [<alex2grad AT gmail.com>]

Submitted By: <alex2grad AT gmail.com>]
Committed By: covener



Submitted by: covener
Reviewed by: covener, jim, wrowe


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CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability. **



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mod_proxy_{ajp,fcgi}: Fix a possible crash when reusing an established
backend connection, happening with LogLevel trace2 or higher configured,
or at any log level with compilers not detected as C99 compliant (e.g.
MSVC on Windows).


Submitted by: ylavic
Reviewed by: ylavic, jim, covener


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(r1772490 in trunk)

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(r1739569 in trunk)

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backport of latest mod_http2 related changes.



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