Return HTTP 504 rather than 503 when a proxy timeout is hit.

Part of the review for PR: 56188


Submitted by: elukey
Reviewed by: elukey, jim, wrowe


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event: close a race condition where we might re-enable listeners while they
are already or about to be closed.


Submitted by: ylavic
Reviewed by: ylavic, jim, wrowe


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merge of r1780598,1781304,1782875,1782944,1782958,1782975 from trunk



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stabilizes


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revert r1780909 and r1773397 ProxyPass ! perdir

r1773397 had a regression and the whole thing is fishy
to shoehorn the current ProxyPass ! syntax into.



add no-proxy envvar for mod_proxy

replacement for ProxyPass /path ! when ProxyPass is in
location context.


Submitted by: covener
Reviewed by: covener, jim, jorton


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Add debugging info to the HttpProtocolOption directive doc

In bugzilla and users@ we keep receiving questions about
how to test the new restrictions imposed by HttpProtocolOptions.
Added some info about how to use openssl s_client properly
and the mod_dumpio's directives to debug (thanks to
Daniel Ferradal for this suggestion).



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* mod_auth_digest: Use anonymous shm by default, fall back on name-based.

Submitted by: jkaluza
Reviewed by: jorton, ylavic, jim


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