Add simple regression test on lock handling during copy and move (to easily
trigger some code in mod_dav that I tried to look at).

* subversion/tests/cmdline/lock_tests.py
  (copy_dir_with_locked_file): New function.
  (test_list): Add copy_dir_with_locked_file.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1643797 13f79535-47bb-0310-9956-ffa450edef68