Merge r1039304, r1053584 from trunk:

* Put a note in the connection notes that the SSL handshake to the backend
  failed such that mod_proxy can put the worker in error state.

PR: 50332
Submitted by: Daniel Ruggeri <DRuggeri primary.net>
Reviewed by: rpluem


* Fix r1039304 and make the patch similar to the one proposed for
  2.2.x: If the SSL handshake to the backend fails we cannot even
  sent an HTTP request. So the check needs to happen already when
  we sent data not when we receive data.

Reviewed by: rpluem, jim, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1069773 13f79535-47bb-0310-9956-ffa450edef68