Important package setup changes

Starting with new version 2.4, multiple upstream and packaging changes in
file setup will requires manual intervention after upgrade to migrate
configuration:
- modules files are now located under /usr/lib/httpd/modules, instead of
  /usr/lib/apache/modules, but the relative path from apache base directory
  %didn't change
- all LoadModule directives are now located in files located under
  /etc/httpd/conf/modules.d, and are likely to duplicate directives previously
  located in /etc/httpd/conf/httpd.conf
- /etc/httpd/conf/httpd.conf now contains only core directives, many other are now
  located in various files under /etc/httpd/conf/conf.d
- additional upstream changes documented here:
  http://httpd.apache.org/docs/2.4/upgrading.html