Ensure that the proper status line is written to the client, fixing

incorrect status lines caused by filters which modify r->status without
resetting r->status_line, such as the built-in byterange filter.

Note: For the byterange example, the handler must set r->status_line
even though this is a 200 response.  Some proxy-type modules blindly
set r->status_line as set by the origin server and thus trigger
the problem with byteranges if the origin server didn't handle the
byterange.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@379562 13f79535-47bb-0310-9956-ffa450edef68