Refactor kustomize config command structure

- Create cfg, fn, live parent commands

cmd/config/configcobra/cfg.go

@@ -0,0 +1,32 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package configcobra
+
+import (
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/cmd/config/internal/commands"
+)
+
+func GetCfg(name string) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "cfg",
+		Short: "Commands for reading and writing configuration.",
+	}
+
+	cmd.AddCommand(commands.AnnotateCommand(name))
+	cmd.AddCommand(commands.CatCommand(name))
+	cmd.AddCommand(commands.CountCommand(name))
+	cmd.AddCommand(commands.CreateSetterCommand(name))
+	cmd.AddCommand(commands.CreateSubstitutionCommand(name))
+	cmd.AddCommand(commands.FmtCommand(name))
+	cmd.AddCommand(commands.GrepCommand(name))
+	cmd.AddCommand(commands.InitCommand(name))
+	cmd.AddCommand(commands.ListSettersCommand(name))
+	cmd.AddCommand(commands.MergeCommand(name))
+	cmd.AddCommand(commands.Merge3Command(name))
+	cmd.AddCommand(commands.SetCommand(name))
+	cmd.AddCommand(commands.TreeCommand(name))
+
+	return cmd
+}