LU-14192 mdt: check for overstriping correctly

LU-14192 mdt: check for overstriping correctly

check for overstriping in the first component as well

HPE-bug-id: LUS-9430
Signed-off-by: Vitaly Fertman <c17818@cray.com>
Change-Id: Ice125b885681b0cf71dc55c5238c4c4d7d7bb970
Reviewed-on: https://es-gerrit.dev.cray.com/157999
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Tested-by: Elena Gryaznova <c17455@cray.com>
Reviewed-by: Alexander Zarochentsev <c17826@cray.com>
Reviewed-on: https://review.whamcloud.com/40896
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>