Merge r609394, r609538, r609540 from trunk:

* Fix cases with non blocking reads from the ap_http_filter input filter where
  chunk size lines or empty lines after a chunk are read incomplete. This can
  lead to a corruption inside the dechunking algorithm.
  This patch has an issue with larger chunk-extensions which need to get thrown
  away since we ignore them anyway.

PR: 19954, 41056
Tested by: niq

* Optimize solution from r609394 and remove chunk-extensions restriction that
  was in r609394.

* Optimize alignment.

Submitted by: rpluem
Reviewed by: rpluem, jim, niq


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@610119 13f79535-47bb-0310-9956-ffa450edef68