Improve failure mode.
Improve failure mode.

* subversion/tests/cmdline/davautocheck.sh
  (fail): Invoke stop_httpd_and_die() instead of running 'exit 1' to
   shut down httpd in case it's running but unresponsive (e.g. because
   of an unusable generated configuration).

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion