Merge r1640040, r1640042 from trunk:

mod_proxy_fcgi, mod_authnz_fcgi: stop reading the response and issue an error
when parsing or forwarding the response fails.


Follow up to r1640040: CHANGES entry.
Submitted by: ylavic
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1642855 13f79535-47bb-0310-9956-ffa450edef68