'Returns the details of a single group_type.
For more information, please refer to the official API reference:
https://developer.openstack.org/api-ref/block-storage/v3/#show-group-type-details'

def show_group_type(self, group_type_id):

    url = ('group_types/%s' % group_type_id)
    (resp, body) = self.get(url)
    body = json.loads(body)
    self.expected_success(200, resp.status)
    return rest_client.ResponseBody(resp, body)
