Off-by-one count was causing not all the mirror table parameters

Off-by-one count was causing not all the mirror table parameters
that were necessary to be passed on to userspace.

The cluster mirror table (log portion only) used to look like this:
        clustered-disk <parm_count> <disk> <region_size> <uuid> \
                        [[no]sync] [block_on_error]
Now it looks like this:
        userspace <parm_count> <uuid> clustered-disk <disk> <region_size> \
                        [[no]sync]

So, there is one extra argument in the latter case - this was
unaccounted for.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>