clientv3/retry.go
func RetryClusterClient(c *Client) pb.ClusterClient {
	return &retryClusterClient{
		cc: pb.NewClusterClient(c.conn),
	}
}
func RetryClusterClient(c *Client) pb.ClusterClient {
	return &retryClusterClient{
		cc: pb.NewClusterClient(c.conn),
	}
}
// RetryClusterClient implements a ClusterClient.