Fix test failure on Windows from r1332174.
Fix test failure on Windows from r1332174.

* subversion/tests/cmdline/merge_symmetric_tests.py
  (expected_symmetric_merge_output): Use os.path.sep instead of '/'.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1332190 13f79535-47bb-0310-9956-ffa450edef68

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