fix build failures

pkg/minikube/machine/cluster_test.go

@@ -108,8 +108,6 @@ func TestStartHostExists(t *testing.T) {
 	RegisterMockDriver(t)
 	api := tests.NewMockAPI(t)
 
-	n := defaultNodeConfig
-
 	// Create an initial host.
 	ih, err := createHost(api, defaultClusterConfig, config.Node{Name: "minikube"})
 	if err != nil {

pkg/minikube/node/node.go

@@ -32,6 +32,7 @@ const (
 	mountString      = "mount-string"
 	createMount      = "mount"
 	waitTimeout      = "wait-timeout"
+	imageRepository  = "image-repository"
 )
 
 // Add adds a new node config to an existing cluster.