xfs/104: log size too small for 4k sector drives

xfs/104: log size too small for 4k sector drives

xfs/104, xfs/119, xfs/291 and xfs/297 have small fixed log sizes. A
recent change to the kernel ramdisk changed it's physical sector
size from 512B to 4kB, and this results in mkfs calculating a log
size larger than the fixed test size and hence the tests fail.

Change the log size to a larger size that works with 4k sectors, and
also increase the size of the filesystem being created so that the
amount of data space in the filesystem does not change and hence
does not perturb the rest of the test.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>