LU-9772 utils: Enable new ZFS MMP on mkfs

LU-9772 utils: Enable new ZFS MMP on mkfs

ZFS 0.7.0 come with new multi-modifier protection, this patch
enables it by default, on mkfs.

This also ensures canmount is off for pools that were not just
created.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: If9b87e9786e0eaefe5ac9a536edcdca3d1012585
Reviewed-on: https://review.whamcloud.com/28051
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>