Upstart: install inotify-tools only once (avoid CHEF-3694 warning).

This PR avoids the resource-cloning ([CHEF-3694](https://tickets.opscode.com/browse/CHEF-3694)) warning that triggers when deploying more than one container as upstart services.

The reason is that the generated upstart service depends on the `inotify-tools` package (which must be present at compile-time since the docker_cmd commands run at compile-time); since this package is installed as a technical detail, I think that it should indeed be installed from within the docker_container LWRP as today and not in an external recipe.