LU-6844 tests: re-enable striped dir

LU-6844 tests: re-enable striped dir

Since this failure should be fixed by
http://review.whamcloud.com/21088

Let's revert http://review.whamcloud.com/20022
to re-enable striped dir in replay-single 70b.

Test-Parameters: trivial testlist=replay-single,replay-single,replay-single,replay-single,replay-single,replay-single
Signed-off-by: Di Wang <di.wang@intel.com>
Change-Id: Ie7fc18d4d57a74be6925d8a635fdb09d4917a2e7
Reviewed-on: http://review.whamcloud.com/21508
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>