Update bundle extension

It's now .dab, for Distributed Application Bundle

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Upstream-commit: 61e2d4240ba266518d0a9a862a88201e54502a88
Component: engine

components/engine/api/client/stack/deploy.go

@@ -31,7 +31,7 @@ func newDeployCommand(dockerCli *client.DockerCli) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:     "deploy [OPTIONS] STACK",
 		Aliases: []string{"up"},
-		Short:   "Create and update a stack",
+		Short:   "Create and update a stack from a Distributed Application Bundle (DAB)",
 		Args:    cli.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			opts.namespace = args[0]