module/raid: write initial superblock

When creating the raid_bdev with enabled superblock option, write the
superblock to the base bdevs before bringing the array online.

Change-Id: I24659202ef3bbe

module/raid: write initial superblock

When creating the raid_bdev with enabled superblock option, write the
superblock to the base bdevs before bringing the array online.

Change-Id: I24659202ef3bbe6c87ca8603d514bd81660c9b41
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16162
Reviewed-by: Ben Walker <ben@nvidia.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

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