When obtaining information on moved away nodes, properly ignore rows that are
not moves, but just representations of deletes of lower layers.

* subversion/libsvn_wc/wc_db_update_move.c
  (get_info): Add filtering. Update documentation.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1538687 13f79535-47bb-0310-9956-ffa450edef68
* subversion/tests/libsvn_wc/op-depth-test.c
  (test_funcs): Following up on r1538687, remove XFail marker.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1538689 13f79535-47bb-0310-9956-ffa450edef68