Add an XFail test for locking switched files.
Add an XFail test for locking switched files.

* subversion/tests/clients/cmdline/lock_tests.py
  (lock_switched_files): New test.
  (test_list): XFail lock_switched_files.

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