Added XFAIL test for issue #4267 (cleanup not run on lock root).

* subversion/tests/cmdline/wc_tests.py (cleanup_below_wc_root): New test.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1431423 13f79535-47bb-0310-9956-ffa450edef68