mod_ssl: using improved mod_md md_get_certificate optional function when available


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mod_md: 
 * Improved interface to mod_ssl for fallback handling. Backward compatible to previous mod_ssl
   patch, but fallbacks will not work.
 * Provide a temporary, self-signed certificate with a speaking command and domain name if we
   have no other cert for a Managed Domain, yet. Refs github issue #32
 * Continue to provide expired or not-completely matching, existing certificate for a Managed
   Domain until the renewal was successful. This is helpful when one adds a DNS name to
   a MD, so the previous domains can be served while a new cert is requested.
 * All files necessary to run tests are not in the release package.
 * Making "http-01" the preferred challenge type again, as people "tls-sni-01" requires at least
   one working certificate vhost right now - which not everyone has.
 * moved part of the MD sanity checks from post_config to check_config phase, allowing for error
   detection in check-only runs.



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mod_md: v0.8.1 from github, new feats in CHANGES



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This commit is a follow up of r1805189, in which
a new logic was added to allow to repeat a directive
name only if its type is different (like SSLPolicy
and <SSLPolicy>). The change broken french translations
since the $this variable, containing the translated
sections, was not used anymore.

The XPath code could surely be improved, but it seems
more pressing to allow our translators to get back
to their daily work without interference.

build.sh validate-* worked fine, as well as the build.sh fr
translation.



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Style is not perfect, but at least, the warning is fixed.

warning: format ‘%c’ expects argument of type ‘int’, but argument 10 has type ‘long unsigned int’ [-Wformat=]

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warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument <n> has type ‘<something> *’ [-Wformat=]

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mod_proxy_fcgi.c:893:19: warning: ‘flushpoll’ may be used uninitialized in this function [-Wmaybe-uninitialized]

This warning is a false positive.

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This change completes r1805372 and also fixes
links generation for <ManageDomain> and <SSLPolicy>
in sections.xml



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In r1805193 synopsis.xsl was changed to allow two directives
of different type (like <SSLPolicy> and SSLPolicy) to share
the same name but have different ids (and please validate-xml/xhtml).
The downside of this action was that all the quicklinks to
existing directive sections (like <If>, <VirtualHost>, etc..)
were changed, possibly breaking external clients already
referencing them.

This change introduces a new attribute in the directivesynopsis
DTD, namely 'idtype', that will be appended to 'name'
in the id generation by synopsis.xsl. This will rollback
link names to their previous values and will allow documentators
to fine tune directivesynopsis sections as they need
(for example we have recently introduced mod_md's
ManagedDomain/<ManagedDomain>, and modssl's SSLPolicy/<SSLPolicy>).

This approach seems more precise and less invasive to me.
Of course the name of the attribute can be changed later on
to whatever term would fit best, the main concern for me at
the moment is to restore the trunk documentation to its previous
state.



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mod_md v0.7.0: 
     - LIVE: the real Let's Encrypt CA is now live by default! If you need to experiment, configure
           MDCertificateAuthority https://acme-staging.api.letsencrypt.org/directory   
     - When existing, complete certificates are renewed, the activation of the new ones is
       delayed by 24 hours (or until the existing ones expire, whatever is earler) to accomodate
       for clients with weird clocks, refs #1. 
     - Fixed store sync when MDCAChallenges was removed again from an MD. 
     - Fixed crash when MD matched the base server, fixes #23
     - Fixed watchgod resetting staging when server processes disappeared (e.g. reached
       max requests or other limits).



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mod_ssl.xml: adding description of predefined policies, some work tweakings.


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mod_ssl.xml: use of new section directive ids, tweaking examples and some language.


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