Warn for every _ flag user or cmd defined

also renames all global _ flags to -

pkg/kubectl/cmd/cmd_test.go

@@ -22,6 +22,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"reflect"
 	"testing"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -276,3 +277,29 @@ func ExamplePrintReplicationController() {
 	// CONTROLLER   CONTAINER(S)   IMAGE(S)    SELECTOR   REPLICAS
 	// foo          foo            someimage   foo=bar    1
 }
+
+func TestNormalizationFuncGlobalExistance(t *testing.T) {
+	// This test can be safely deleted when we will not support multiple flag formats
+	root := NewKubectlCommand(cmdutil.NewFactory(nil), os.Stdin, os.Stdout, os.Stderr)
+
+	if root.Parent() != nil {
+		t.Fatal("We expect the root command to be returned")
+	}
+	if root.GlobalNormalizationFunc() == nil {
+		t.Fatal("We expect that root command has a global normalization function")
+	}
+
+	if reflect.ValueOf(root.GlobalNormalizationFunc()).Pointer() != reflect.ValueOf(root.Flags().GetNormalizeFunc()).Pointer() {
+		t.Fatal("root command seems to have a wrong normalization function")
+	}
+
+	sub := root
+	for sub.HasSubCommands() {
+		sub = sub.Commands()[0]
+	}
+
+	// In case of failure of this test check this PR: spf13/cobra#110
+	if reflect.ValueOf(sub.Flags().GetNormalizeFunc()).Pointer() != reflect.ValueOf(root.Flags().GetNormalizeFunc()).Pointer() {
+		t.Fatal("child and root commands should have the same normalization functions")
+	}
+}