Merge r420307 from trunk:

* Add the filename of the configuration file to the warning message
  about the useless use of AllowOverride.

PR: 39992
Submitted by: Darryl Miles <darryl darrylmiles.org>
Reviewed by: rpluem, jim, pquerna


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@662567 13f79535-47bb-0310-9956-ffa450edef68