Add a regression test for 'svn diff --properties-only'.
Add a regression test for 'svn diff --properties-only'.

* subversion/tests/cmdline/diff_tests.py
  (diff_properties_only, test_list): New test.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1339190 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion