Refactor the ready_event so that it's scope is the absolute minimum
  necessary... we were leaking ready_event's.  Close it in the parent
  and child the moment it is no longer needed.

  Also, fail more gracefully if the child process terminates before we
  ever receive the ready_event [should improve robustness significantly.]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96216 13f79535-47bb-0310-9956-ffa450edef68