Cleanup the input filtering a bit. This does not work with telnet

currently, but it is a step in the right direction.  Input filtering
should be slowly improving from here on out.
Submitted by:	Greg Ames, Ryan Bloom, Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86547 13f79535-47bb-0310-9956-ffa450edef68