Merge r616517, r617653 from trunk:

* Fix processing of chunked responses if Connection: Transfer-Encoding is
  set in the response of the proxied system.

PR: 44311
Submitted by: rpluem
Reviewed by: jim, rpluem, mturk


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@617686 13f79535-47bb-0310-9956-ffa450edef68