update cobra and use Tags

Signed-off-by: Victor Vieux <vieux@docker.com>

command/stack/cmd.go

@@ -17,6 +17,7 @@ func NewStackCommand(dockerCli *command.DockerCli) *cobra.Command {
 		Run: func(cmd *cobra.Command, args []string) {
 			fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString())
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 	cmd.AddCommand(
 		newConfigCommand(dockerCli),

command/stack/deploy.go

@@ -36,6 +36,7 @@ func newDeployCommand(dockerCli *command.DockerCli) *cobra.Command {
 			opts.namespace = strings.TrimSuffix(args[0], ".dab")
 			return runDeploy(dockerCli, opts)
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 
 	flags := cmd.Flags()