mod_disk_cache: Produce slightly more informative log messages and at more

appropriate levels.  (LogLevel info will now only inform you when you are
storing a cache item.  debug is required to show what is being served from
cache.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104497 13f79535-47bb-0310-9956-ffa450edef68