Make kubectl bash completion namespace aware and add noun aliases

- add namespace filtering to bash completion
- add --namespace flag bash completion
- add bash completion noun aliases
- adapt to new cobra package structure

pkg/kubectl/cmd/label.go

@@ -73,11 +73,12 @@ func NewCmdLabel(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	options := &LabelOptions{}
 
 	// retrieve a list of handled resources from printer as valid args
-	validArgs := []string{}
+	validArgs, argAliases := []string{}, []string{}
 	p, err := f.Printer(nil, false, false, false, false, false, false, []string{})
 	cmdutil.CheckErr(err)
 	if p != nil {
 		validArgs = p.HandledResources()
+		argAliases = kubectl.ResourceAliases(validArgs)
 	}
 
 	cmd := &cobra.Command{
@@ -89,7 +90,8 @@ func NewCmdLabel(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 			err := RunLabel(f, out, cmd, args, options)
 			cmdutil.CheckErr(err)
 		},
-		ValidArgs: validArgs,
+		ValidArgs:  validArgs,
+		ArgAliases: argAliases,
 	}
 	cmdutil.AddPrinterFlags(cmd)
 	cmd.Flags().Bool("overwrite", false, "If true, allow labels to be overwritten, otherwise reject label updates that overwrite existing labels.")