LU-7592 osd-ldiskfs: increase supported ldiskfs fs size limit

LU-7592 osd-ldiskfs: increase supported ldiskfs fs size limit

Change "force_over_128tb" mount option to "force_over_256tb".

Signed-off-by: Alexander Zarochentsev <alexander.zarochentsev@seagate.com>
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>
Seagate-bug-id: MRP-2840
Reviewed-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>
Reviewed-by: Alexey Leonidovich Lyashkov <alexey.lyashkov@seagate.com>
Tested-by: Elena V. Gryaznova <elena.gryaznova@seagate.com>
Change-Id: Ib53c4375a170823997a5a6b9ef6d832e8b3e0c72
Reviewed-on: http://review.whamcloud.com/17702
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>