Make the default_handler catch all requests that aren't served by

another handler.  This also gets us to return a 404 if a directory
is requested, there is no DirectoryIndex, and mod_autoindex isn't
loaded.

PR:	8045
Submitted by:	Justin Erenkrantz


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95690 13f79535-47bb-0310-9956-ffa450edef68