ra_serf: Accept a minor difference in returned error value with copy test.
ra_serf: Accept a minor difference in returned error value with copy test.

* subversion/tests/cmdline/copy_tests.py
  (url_to_non_existent_url_path): Accept the lowest directory part as not
  being found instead of forcing the RA layer to walk all the way up to the
  root.

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