Make the disabling of chunked encoding on connection close optional and disable by default since automatically disabling it causes a regression (see this discussion http://tomcat.markmail.org/thread/zvrrtvwme6liefng for the details).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1635524 13f79535-47bb-0310-9956-ffa450edef68