kubeadm: remove warning about config usage

cmd/kubeadm/app/cmd/alpha/selfhosting.go

@@ -141,7 +141,7 @@ func getSelfhostingSubCommand(in io.Reader) *cobra.Command {
 	// Add flags to the command
 	// flags bound to the configuration object
 	cmd.Flags().StringVar(&cfg.CertificatesDir, "cert-dir", cfg.CertificatesDir, `The path where certificates are stored`)
-	cmd.Flags().StringVar(&cfgPath, "config", cfgPath, "Path to a kubeadm config file. WARNING: Usage of a configuration file is experimental")
+	options.AddConfigFlag(cmd.Flags(), &cfgPath)
 
 	cmd.Flags().BoolVarP(
 		&certsInSecrets, "store-certs-in-secrets", "s",

cmd/kubeadm/app/cmd/config.go

@@ -329,7 +329,7 @@ func NewCmdConfigUploadFromFile(out io.Writer, kubeConfigFile *string) *cobra.Co
 			kubeadmutil.CheckErr(err)
 		},
 	}
-	cmd.Flags().StringVar(&cfgPath, "config", "", "Path to a kubeadm config file. WARNING: Usage of a configuration file is experimental.")
+	options.AddConfigFlag(cmd.Flags(), &cfgPath)
 	return cmd
 }
 

cmd/kubeadm/app/cmd/init.go

@@ -238,10 +238,7 @@ func AddInitConfigFlags(flagSet *flag.FlagSet, cfg *kubeadmapiv1beta1.InitConfig
 
 // AddInitOtherFlags adds init flags that are not bound to a configuration file to the given flagset
 func AddInitOtherFlags(flagSet *flag.FlagSet, cfgPath *string, skipTokenPrint, dryRun *bool, ignorePreflightErrors *[]string) {
-	flagSet.StringVar(
-		cfgPath, options.CfgPath, *cfgPath,
-		"Path to kubeadm config file. WARNING: Usage of a configuration file is experimental.",
-	)
+	options.AddConfigFlag(flagSet, cfgPath)
 	flagSet.StringSliceVar(
 		ignorePreflightErrors, options.IgnorePreflightErrors, *ignorePreflightErrors,
 		"A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks.",

cmd/kubeadm/app/cmd/token.go

@@ -129,8 +129,8 @@ func NewCmdToken(out io.Writer, errW io.Writer) *cobra.Command {
 			kubeadmutil.CheckErr(err)
 		},
 	}
-	createCmd.Flags().StringVar(&cfgPath,
-		"config", cfgPath, "Path to kubeadm config file (WARNING: Usage of a configuration file is experimental)")
+
+	options.AddConfigFlag(createCmd.Flags(), &cfgPath)
 	createCmd.Flags().BoolVar(&printJoinCommand,
 		"print-join-command", false, "Instead of printing only the token, print the full 'kubeadm join' flag needed to join the cluster using the token.")
 	bto.AddTTLFlagWithName(createCmd.Flags(), "ttl")