Now that throttling has been moved to the BlockBackend level, we do not
need to create a BDS along with the BB in the I/O throttling test.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>