Convert the hostname to all-lowercase in fix_hostname() so that

Convert the hostname to all-lowercase in fix_hostname() so that
the implementation matches the comments.  (Note: The current virtual
hosting code does case-insensitive host matching, so this fix is useful
mostly to help ensure that custom modules and any future vhosting code
don't get tripped up by case-sensitivity issues.)
Submitted by:	Perry Harrington <pedward@webcom.com>
Reviewed by:	Brian Pane

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95866 13f79535-47bb-0310-9956-ffa450edef68