Backport r1604350 and r1605067 from trunk:

* event MPM: fix a race where a worker looks at a conn_rec after it might be
  in use by another thread or may have been freed and 
  re-allocated.

Submitted By: Edward Lu



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1605619 13f79535-47bb-0310-9956-ffa450edef68