Add the regression test I wrote earlier today, even though it doesn't really
reproduce this issue.

* subversion/tests/cmdline/authz_tests.py
  (authz_del_from_subdir): New test.
  (test_list): Add authz_del_from_subdir


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1452967 13f79535-47bb-0310-9956-ffa450edef68