Introduce envs field.

pkg/commands/kustfile/kustomizationfile_test.go

@@ -81,7 +81,7 @@ func TestWriteAndRead(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Couldn't read kustomization file: %v\n", err)
 	}
-	kustomization.DealWithMissingFields()
+	kustomization.FixKustomizationPostUnmarshalling()
 	if !reflect.DeepEqual(kustomization, content) {
 		t.Fatal("Read kustomization is different from written kustomization")
 	}