mod_ssl: work around leaks on (graceful) restart.

Tested with valgrind and --with-ssl shared/static.


mod_ssl: follow up to r1781187.
The ssl_util_thread_*() functions are not necessary with openssl-1.1+


mod_ssl: follow up to r1781187.
Address SSL_CTX leak in (merged) proxy_ctx.


Reviewed by: ylavic, jim, wrowe


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https://www.openssl.org/docs/fips/ - using FIPS_mode_set(1) for revalidation
was actually expressly called out in section 3. While mod_ssl is 'unloaded'
(unconfigured) the process is not operating in a fips validated manner, but
once the configuration resets FIPS_mode_set(1) it resumes validated behavior.




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donating lua server-status script, enjoy!
Submitted by: humbedooh
Reviewed by: humbedooh


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Add a warning in the docs about nested <If> blocks



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Look for specific versioned installs of Lua 5.3
Reviewed by: jim


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nowhere to go but forward. Passes regression on 1.1.0 and on earlier openssl.



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avoid SO_REUSEPORT w/o ListenCoresBucketsRatio 

Can lead to unintended/confusing sharing between 
multiple servers started by the same ID.

Submitted by: covener
Reviewed by: jorton, covener, wrowe


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Add a note in the docs about evaluation of Location sections

The sections.html doc was missing, in my opinion, a direct
reference to the fact multiple Location blocks matching
a HTTP request will be evaluated in the order in which they
appear in the configuration files (same as Ifs, etc..).

Reworked a bit a single block of text to be a bit more readable.



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 Merged /httpd/httpd/trunk:r1784571,1785672,1785683,1786512,1786575-1786576
 mod_http2/mod_proxy_http2 backport



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