Fix chunking. Two bugs fixed.

1)  don't put the trailing 0\r\n\r\n in lenstr; that buffer is
    already in use (pointed to by another transient bucket); using
    lenstr again overlays that other chunk header
2)  insert the bucket with the trailing "0\r\n\r\n" *before* the eos bucket
Submitted by:	Jeff Trawick <trawickj@bellsouth.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86095 13f79535-47bb-0310-9956-ffa450edef68