Update node defaults

Do not enable leases by default in the node constructor.
Simplify node constructor to not require a lease client when leases may
not even be enabled.

Updates node status update interval to the kubelet default of 10s (was
5s in vk).

vkubelet/node_test.go

@@ -33,11 +33,14 @@ func testNodeRun(t *testing.T, enableLease bool) {
 	leases := c.Coordination().Leases(corev1.NamespaceNodeLease)
 
 	interval := 1 * time.Millisecond
-	node, err := NewNode(testP, testNode(t), leases, nodes,
+	opts := []NodeOpt{
 		WithNodePingInterval(interval),
 		WithNodeStatusUpdateInterval(interval),
-		WithNodeDisableLease(!enableLease),
-	)
+	}
+	if enableLease {
+		opts = append(opts, WithNodeEnableLeaseV1Beta1(leases, nil))
+	}
+	node, err := NewNode(testP, testNode(t), nodes, opts...)
 	assert.NilError(t, err)
 
 	chErr := make(chan error)
@@ -157,12 +160,11 @@ func TestNodeCustomUpdateStatusErrorHandler(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	node, err := NewNode(testP, testNode(t), nil, nodes,
+	node, err := NewNode(testP, testNode(t), nodes,
 		WithNodeStatusUpdateErrorHandler(func(_ context.Context, err error) error {
 			cancel()
 			return nil
 		}),
-		WithNodeDisableLease(true),
 	)
 	assert.NilError(t, err)