Fix switch_tests 16 on Windows.
Fix switch_tests 16 on Windows.

* subversion/tests/cmdline/svntest/main.py
  (add_repo_path): Make sure the repository url path separator is '/'.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@868722 13f79535-47bb-0310-9956-ffa450edef68

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