merge from trunk:removing HTTP_HEADER output filter on upgraded connections,...

merge from trunk:removing HTTP_HEADER output filter on upgraded connections, so timeouts do not send http/1.1 responses any more

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1718600 13f79535-47bb-0310-9956-ffa450edef68