As commented, ensure we don't flag a request as a rejected 0.9 request

if we identified any other parsing errors and handle all 0.9 request
errors as 400 BAD REQUEST, presuming HTTP/1.0 to deliver the error details.
Do not report 0.9 issues as 505 INVALID PROTOCOL because the client apparently
specified no protocol, and 505 post-dates the simple HTTP request mechanism.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1757065 13f79535-47bb-0310-9956-ffa450edef68