LU-9490 llite: return v1/v3 layout for legacy app

LU-9490 llite: return v1/v3 layout for legacy app

Legacy app such as ADIO fetches LOVEA by ioctl LL_IOC_LOV_GETSTRIPE
and treats file layout as v1/v3 blindly, we'd return a reasonable
v1/v3 in this case.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: I95694c3e32013c75da097f2f6ae4e8915503596e
Reviewed-on: https://review.whamcloud.com/27183
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>