'Stop balancer\'s listener listening the given port.
:param balancer: a load balancer
:type balancer: ``LoadBalancer``
:param port: listening port
:type port: ``int``
:return: whether operation is success
:rtype: ``bool``'

def ex_stop_listener(self, balancer, port):

    params = {'Action': 'StopLoadBalancerListener', 'LoadBalancerId': balancer.id, 'ListenerPort': port}
    resp = self.connection.request(self.path, params)
    return resp.success()
