'List all consumers.
For more information, please refer to the official
API reference:
http://developer.openstack.org/api-ref/identity/v3-ext/#list-consumers'

def list_consumers(self):

    (resp, body) = self.get('OS-OAUTH1/consumers')
    self.expected_success(200, resp.status)
    body = json.loads(body)
    return rest_client.ResponseBody(resp, body)
