Streamline TLS session ticket key handling (added in r1200040):
- drop the SSLTicketKeyDefault directive, and only support a single
  ticket key per server/vhost
- rename the SSLTicketKeyFile directive to SSLSessionTicketKeyFile,
  remove the keyname parameter
- move ticket key parameters from SSLSrvConfigRec to modssl_ctx_t
- configure the tlsext_ticket_key_cb only when in server mode
- add documentation for SSLSessionTicketKeyFile


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Limit length of lines in .htaccess to 8K again, to reduce DoS potential.
Make ap_varbuf_cfg_getline() strictly enforce the max_len parameter.


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Fix names of unary operators like '-s' being compared case insensitively.
Improve error message if op or function is not found. Document '-s' operator.


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Various fixes for log message tags:

- Remove tags in ssl_log_ssl_error() and ssl_log_cert_error()
- Instead add tags to various ssl_log_xerror, ssl_log_cxerror
  calls (ssl_log_rxerror is unused).
- likewise for modssl_proxy_info_log()

- Fix spelling of APLOG_NOERRNO in coccinelle script
- add support for ssl_log_*error and ap_log_cserror

- add some more tags missing due to APLOG_NOERRNO spelling error

- Remove tags from example modules (we don't want people to blindly copy
  those)



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Remove usage of APLOG_NOERRNO. It has been a no-op since at least 2.0.x


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Remove unused variable



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Adjust the OpenSSL session id context for SNI configurations, so that
sessions are tied to the proper vhost (subset of a patch I originally
proposed in November 2009, cf. message with ID <4AF85A18.1000205@velox.ch>).


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Create initial documentation for mod_socache_shmcb, mod_socache_dc,
mod_socache_dbm and mod_socache_memcache.


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Create mod_cache.imp dynamically; fixed mod_cache_disk NLM name.


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mod_cache: Remove dead code from the legacy mod_mem_cache module.


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Overhaul the caching guide in an effort to clearly distinguish between
the mod_cache caching, the socache caching, and other caching we do, such
as mod_file_cache.


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Fix a few compiler warning reported by Steffen:
- some signed/unsigned mismatches
- const for a function does not make sense


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Add lots of unique tags to error log messages

ssl_util.c: Downgrade some dynamic locking messages from level DEBUG
to TRACE1-3


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Change the provider names to match the module names:
mod_slotmem_shm: shared -> shm
mod_socache_memcache: mc -> memcache


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More pointers to mod_socache*


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per module as the proxy_function instead of
the macro __FUNCTION__ which is not C89.

There's no real loss of information, because all
of the calls are in the same scgi handler function.

All proxy modules apart form SCGI already use the
upper case scheme in the analogous calls.

Backport of r1210124 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1210125 13f79535-47bb-0310-9956-ffa450edef68

Point to mod_socache_* in the SSLSessionCache error message


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mod_proxy: Remove dead code from the public API, move single use code out
of the public API, remove redundant code from the public API.
mod_cache: Remove redundant code from the public API.


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mod_proxy: Make ap_proxy_retry_worker() into an optional function. Allows
mod_lbmethod_bybusyness, mod_lbmethod_byrequests, mod_lbmethod_bytraffic
and mod_lbmethod_heartbeat to be loaded without mod_proxy yet being present,
which happens when modules are loaded in alphabetical order.


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Add APLOGNO() macro for unique tags for every log message.


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ap_core_translate: factor out duplicate code.  no functional change.

Submitted by: Greg Ames


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Fix apr_status_t being passed as loglevel


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- Add some error handling for writing to the output filter chain.
- Add some ap_assert()s for error cases that probably should not happen (and
  the following code would break).
  These fix some compiler warnings about "variable 'rv' set but not used".
- Prevent a leak of a bucket in one error case.


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mod_auth_form: Use apr_status_t for the mod_session API.


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