LU-15200 llite: "lfs getdirstripe -D" shows inherit layout

LU-15200 llite: "lfs getdirstripe -D" shows inherit layout

Once system-wide default LMV is set, "lfs getdirstripe -D subdir"
should show inherited layout from it.

Add sanity 413f.

Lustre-change: https://review.whamcloud.com/45570
Lustre-commit: 61b1fad9e3fb21edcc0e713c89a3bfaeba9c883e

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: If7354cb4093c58f6d56a6a4d449fb69a9deec7cc
Reviewed-on: https://review.whamcloud.com/47642
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>