[test] Fix cygwin os hardlink test.   - add cygwin to list of unsupported platforms for hardlink-to-file test   - add a hardlink-to-directory test which requires root permissions.
[test] Fix cygwin os hardlink test.
  - add cygwin to list of unsupported platforms for hardlink-to-file test
  - add a hardlink-to-directory test which requires root permissions.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@35890 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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