clientv3/retry.go
func RetryLeaseClient(c *Client) pb.LeaseClient {
	return &retryLeaseClient{
		lc: pb.NewLeaseClient(c.conn),
	}
}
func RetryLeaseClient(c *Client) pb.LeaseClient {
	return &retryLeaseClient{
		lc: pb.NewLeaseClient(c.conn),
	}
}
// RetryLeaseClient implements a LeaseClient.