'Information for all the tenant\'s group snapshots.
For more information, please refer to the official API reference:
https://developer.openstack.org/api-ref/block-storage/v3/#list-group-snapshots
https://developer.openstack.org/api-ref/block-storage/v3/#list-group-snapshots-with-details'

def list_group_snapshots(self, **params):

    url = 'group_snapshots'
    if params:
        url += ('?%s' % urllib.urlencode(params))
    (resp, body) = self.get(url)
    body = json.loads(body)
    self.expected_success(200, resp.status)
    return rest_client.ResponseBody(resp, body)
