Clarify invalid scene.json properties

[nearnshaw]

When you attempt to deploy a scene that was built with the Builder, or that is at least 6 months old, it includes some additional parameters in the scene.json that shouldn't be there.

The CLI gives you a message, but doesn't clarify what parameters aren't valid

A lot of people get stuck with this step. If the error message simply said which parameters aren't valid it would be a lot easier

Legacy scenes have these three sections that cause problems:

• communications
• policy
• source