Check the slice's state while invoking methods that require the slice to have been submitted. #464
Description
Check the slice's state while invoking methods that require the slice to have been submitted.
Certain methods require the slice to have been submitted for them to function as expected. For example, Node.configure_nvme requires the slice to have been submitted; otherwise, it won't function as expected. Another example is NetworkService.make_ip_publicly_routable.