The update code for moves isn't preserving nested moves properly.

* subversion/tests/libsvn_wc/op-depth-test.c
  (nested_move_update2): Extend.
  (test_funcs): Mark nested_move_update2 XFAIL.

* subversion/libsvn_wc/wc_db_update_move.c
  (replace_moved_layer): Change comment to note problem.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1431354 13f79535-47bb-0310-9956-ffa450edef68