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Merged 1827912,1827924,1827992,1828222,1828720,1828723,1833588,1833589,1839920,1839946 from trunk

  *) mod_ssl: add experimental support for TLSv1.3 (tested with OpenSSL v1.1.1-pre9. 
     SSL(Proxy)CipherSuite now has an optional first parameter for the protocol the ciphers are for.
     Directive "SSLVerifyClient" now triggers certificate retrieval from the client.
     Verifying the client fails exactly the same for HTTP/2 connections for all SSL protocols,
     as this would need to trigger the master connection thread - which we do not support
     right now.
     Renegotiation of ciphers is intentionally ignored for TLSv1.3 connections. "SSLCipherSuite"
     does not allow to specify TLSv1.3 ciphers in a directory context (because it cannot work) and
     TLSv1.2 or lower ciphers are not relevant for 1.3, as cipher suites are completely separate.
     Sites which make use of such TLSv1.2 feature need to evaluate carefully if or how they 
     can match their needs onto the TLSv1.3 protocol.
     [Yann Ylavic, Stefan Eissing]



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conversion from apr_time_t to milliseconds instead
of hard-coded division by 1000.

Backport of r1839780 from trunk.

Submitted by: rjung
Reviewed by: rjung, rpluem, jim


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in milliseconds.

Backport of remaining parts of r1837590 from trunk
(only html mode changes, auto parts were already
backported).

Submitted by: rjung
Reviewed by: rjung, jim, ylavic


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in mod_status when "ProxyStatus" is "On":
add "busy" count to html mode.

Backport of remaining parts of r1837588 from trunk
(only html mode changes, auto parts were already
backported).

Submitted by: rjung
Reviewed by: rjung, jim, ylavic


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server-status proposals back to the list.

I have only applied the uncontroversial "auto"
mode part of the accepted patches.

The "html" part is now back in STATUS (with
adjusted smaller patches) to give some more
time for feedback whether the HTML output
format is allowed to change during a patch
release.


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format.

Followon to r1839533.


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in milliseconds to auto mode.

Partial backport of r1839532 from trunk
(only auto mode changes, html parts not yet
backported).

Submitted by: rjung
Reviewed by: rjung, jim, ylavic


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in mod_status when "ProxyStatus" is "On":
add "busy" count to auto mode and show byte counts
in auto mode always in units of kilobytes.

Partial backport of r1837588 from trunk
(only auto mode changes, html parts not yet
backported).

Submitted by: rjung
Reviewed by: rjung, jim, ylavic


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processes in the "cu" and "cs" values.
Add CPU time of the parent process to the
"c" and "s" values.

Backport of r1837595 from trunk.

Submitted by: rjung
Reviewed by: rjung, jim, ylavic


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MPMs in "auto" mode.  Added number of processes,
number of stopping processes and number
of busy and idle workers.

This changes only the key/value list of the
server-status "auto" output. The data is already
part of the "html" output.

Backport of r1837589 from trunk.


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mod_ratelimit: Don't interfere with "chunked" encoding.

By the time ap_http_header_filter() sends the header brigade and adds the
"CHUNK" filter, we need to garantee that the header went through all the
filters' stack, and more specifically above ap_http_chunk_filter() which
assumes that all it receives is content data.
Since rate_limit_filter() may retain the header brigade, make it run after
ap_http_chunk_filter(), just before AP_FTYPE_CONNECTION filters.

Also, ap_http_header_filter() shouldn't eat the EOS for HEAD/no-body responses.
For instance mod_ratelimit depends on it since r1835168, but any next request
filter may as well to flush and/or bail out approprietely.

This fixes the regression introduced in 2.4.34 (r1835168).
PR 62568.

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


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r1839250 in trunk

+ remove some trailing spaces to synch with trunk
+ add the optional [s] in WatchdogInterval syntax

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(r1839245 on trunk)

+ remove some trailling spaces to synch with trunk

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Synch with trunk and improve alignment in examples.

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