Use code-generator to generate clientset/informer/lister (#1492)

To reduce maintenance effort and avoid writing duplicate informer code,
use code-generator to generate clientset/informer/lister code.

pkg/fission-cli/cmd/environment/update.go

@@ -71,7 +71,7 @@ func (opts *UpdateSubCommand) run(input cli.Input) error {
 		return errors.Wrap(err, "error updating environment")
 	}
 
-	fmt.Printf("environment '%v' updated\n", opts.env.Metadata.Name)
+	fmt.Printf("environment '%v' updated\n", opts.env.ObjectMeta.Name)
 	return nil
 }