The API 'do_group_snapshot_list' in v3/shell.py misses api_version wraps,
and the cmd 'cinder group-snapshot-list' can be used even not specifing
the param 'os-volume-api-version'. This patch just to fix it.
Change-Id: I6a46e587b1aab692fe6b81b46fa3d95ab66c0625