Refactor kustomize config command structure

- Create cfg, fn, live parent commands

cmd/config/kubectl-krm/main.go

@@ -0,0 +1,28 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"sigs.k8s.io/kustomize/cmd/config/configcobra"
+	"sigs.k8s.io/kustomize/kyaml/commandutil"
+)
+
+func main() {
+	os.Setenv(commandutil.EnableAlphaCommmandsEnvName, "true")
+	cmd := configcobra.AddCommands(&cobra.Command{
+		Use:   "kubectl-krm",
+		Short: "Plugin for configuration based commands.",
+		Long: `Plugin for configuration based commands.
+
+Provides commands for working with Kubernetes resource configuration.
+`,
+	}, "")
+	if err := cmd.Execute(); err != nil {
+		os.Exit(1)
+	}
+}