Property updates are broken, add a regression test.
Property updates are broken, add a regression test.

* subversion/tests/cmdline/prop_tests.py
  (update_props): Extend to update nodes with existing props.
  (test_list): Mark update_props as XFail.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1025628 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion