Comment 47 for bug 1393268

Sorry for leaving it out for such a long time, going back to it now.

I've double-checked all the StackResource class hierarchy, and apart from couple of small fixes,
the only resource violating the design proposed here currently is

ResourceGroup

in its handle_create and handle_update, that both might return lists of scheduler tasks.

I'll look into it and see what can be done, hopefully to close this for good.