Deregister all hooks first (in pre_cleanup), by doing it last we could still
have had them run when DSOs were unloaded.

Likewise, avoid double faults when handling fatal signals by restoring the
default handler before pconf is cleared (we can't ap_log_error there).

Finally, we need to ignore sig_term/restart (do nothing) when the main
process is exiting (i.e. ap_pglobal is destroyed), since retained_data are
freed.

Aimed to fix all faults in PR 61558.



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or function call (e.g. ap_log) may use one while DSOs are unloaded.

See PR 61558 (double/second fault).



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mod_md: v0.9.7
     - Use of the new module flag
     - Removed obsolete function from interface to mod_ssl. 
     - Fallback certificates has version set and no longer claims to be a CA. (re issue #32)
     - MDRequireHttps now happens before any Redirect.



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mod_ssl: make the new module flag used.



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Fix for maintainer-mode compiler errors when including check.h in unit tests.



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Associate ap_get_module_flags() to MMN bump.


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Provide a convenient function to get module flags, and remove useless
AP_MODULE_HAS_FLAGS checks in the core, core's version is at current MMN.



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We need to check that the module itself is at the right version.



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Make use of AP_MODULE_FLAG_ALWAYS_MERGE.


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First one is AP_MODULE_FLAG_ALWAYS_MERGE.



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around pending output data handing; no functional change.



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worker vs listener race condition.



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PR 61546 [Lubos Uhliarik <luhliari redhat.com>]

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mpm_common.h: guarding AP_ENABLE_EXCEPTION_HOOK against use when undefined so that -Wundef does not triggger.



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mod_ssl: unshare SSLSrvConfigRec instances between base server and virtual hosts. This avoids
     overwrites of later initializattions (vhost_id), selective disables by "SSLEngine addr-list"
     and certificate/key pickup from mod_md. 



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This is a follow up of r1808746 after a chat
with Yann on dev@:

- the HTTP:Host variable suffers from the same problem
- the strcasecmp should be used to allow case-sensitive
  comparisons.
- in mod_rewrite is less cumbersome and more clean to just
  make the Host header check in lookup_header, so it will
  be automatically picked up by every part of the code
  that uses it. It shouldn't be a relevant overhead for
  mod_rewrite.



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In PR 58231 is was brought up that httpd adds the
Vary: Host header whenever a condition is set to true
in mod_rewrite or in an <If> block.

The https://tools.ietf.org/html/rfc7231#section-7.1.4
section seems to disallow this use case:

"The "Vary" header field in a response describes "
"what parts of a request message, "
"aside from the method, Host header field, [...]"

I had a chat with the folks in #traffic-server and
they don't see much point in having a Vary: Host header,
plus it was reported that Varnish doesn't like it very
much (namely it does not cache the response when
it sees the header, links of the report in the PR).

I don't see much value in this behavior of httpd so
I am inclined to remove this response header value,
but I'd be glad to get a more experienced opinion.



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mod_md: v0.9.6: a "MDRequireHttps permament" configured domain automatically sends out HSTS (rfc 6797) headers in https: responses. 



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mod_ssl: adding ssl_policies.h[.in] for policy cipher/protocol definitions. Use 
     update_policies.py to update manually from Mozilla JSON definitions at
     https://statics.tls.security.mozilla.org/server-side-tls-conf.json



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mod_md: v0.9.5:
     - New directive (srly: what do you expect at this point?) "MDMustStaple on|off" to control if
       new certificates are requested with the OCSP Must Staple extension.
     - Known limitation: when the server is configured to ditch and restart child processes, for example
       after a certain number of connections/requests, the mod_md watchdog instance might migrate 
       to a new child process. Since not all its state is persisted, some messsages might appear a
       second time in the logs.
     - Adding checks when 'MDRequireHttps' is used. It is considered an error when 'MDPortMap 443:-'
       is used - which negates that a https: port exists. Also, a warning is logged if no 
       VirtualHost can be found for a Managed Domain that has port 443 (or the mapped one) in
       its address list.
     - New directive 'MDRequireHttps' for redirecting http: traffic to a Managed Domain, permanently
       or temporarily.
     - Fix for using a fallback certificate on initial signup of a Managed Domain. Requires also
       a changed mod_ssl patch (v5) to take effect.
     - compatibility with libressl



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