(set_file_slot): New function, allowing auth directives to be

independent of the server root, so the server documents can be
moved to a different directory or machine more easily.
[These changes were accidentally commited with the core -> main change]
Submitted by:	David J. MacKenzie <djm@va.pubnix.com>
Reviewed by:	Dean Gaudet, Brian Behlendorf, Randy Terbush


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79021 13f79535-47bb-0310-9956-ffa450edef68