block: Report data child for query-blockstats

It makes no sense to report the block stats of a purely metadata-storing
child in query-blockstats.  So if the primary child does not have any
data, try to find a unique data-storing child.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>