Merge r1664709, r1697323 from trunk:

 * Do not reset the retry timeout if the worker is in error at this stage even
   if the connection to the backend was successful. It was likely set into
   error by a different thread / process in parallel e.g. for a timeout or
   bad status. We should respect this and should not continue with a connection
   via this worker even if we got one.


* Do a more complete cleanup here. At this point we cannot end up with something useful with the data we created so far.
Submitted by: rpluem
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1704835 13f79535-47bb-0310-9956-ffa450edef68