Add an XFAIL regression test for issue 4347, update with tree-conflict.

* subversion/tests/libsvn_wc/op-depth-test.c
  (update_with_tree_conflict): New test.
  (test_funcs): Add new test.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1465672 13f79535-47bb-0310-9956-ffa450edef68