'Returns the membership of the tenant wrt to the image_id specified.
:param req: the Request object coming from the wsgi layer
:param image_id: The image identifier
:returns: The response body is a mapping of the following form
{\'member_id\': <MEMBER>,
\'image_id\': <IMAGE>,
\'status\': <MEMBER_STATUS>
\'created_at\': ..,
\'updated_at\': ..}'

def show(self, req, image_id, member_id):

    try:
        image = self._lookup_image(req, image_id)
        return self._lookup_member(req, image, member_id)
    except webob.exc.HTTPForbidden as e:
        raise webob.exc.HTTPNotFound(explanation=e.explanation)
