mkfs: set inode alignment and cluster size for minimum log size estimation

mkfs: set inode alignment and cluster size for minimum log size estimation

In order for mkfs to calculate the minimum log size correctly, it must
be able to find the transaction type with the largest reservation.  The
iunlink transaction reservation size calculation depends on having the
inode cluster size set correctly, which in turn depends on the inode
alignment parameters being set as they will be in the final filesystem.
Therefore we have to set up the inoalignmt field in max_trans_res.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>