LU-1187 tests: Add DNE test cases in sanity.

LU-1187 tests: Add DNE test cases in sanity.

1. test_17n: e2fsck check MDTs after remote ops.
2. test_24[x-z]: rename and link validation under remote dir.
3. test_33d openfile and chmod under remote dir.
4. test_230 create/unlink remote dir.

Change-Id: Id0587ab8f7a3daa6ba85ce5255cbd13e6189bd6f
Signed-off-by: Wang Di <di.wang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/4358
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>