Add %a to mod_log_config for inserting the remote IP-address. This is the

adapted patch against 1.3 of Todd Eigenschink <eigenstr@mixi.net>'s original
patch for 1.2.5. For 1.2.5 we don't want it because its a feature.  I also
added corresponding entries to the CHANGES and mod_log_config.html file.

Submitted by: Todd Eigenschink <eigenstr@mixi.net>
Reviewed by: Ralf S. Engelschall


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@80340 13f79535-47bb-0310-9956-ffa450edef68