
'group_id' is mentioned as an optional parameter in api-ref doc for POST /v3/{project_id}/group_snapshots API but in the code if we don't pass group-id it returns BadRequest. This patch fixes this discrepancy by updating the api-ref according to the code. Closes-Bug: #1735177 Change-Id: Id2165a07995ab706d4a327f7340dccee7799c7b6