Remove the extends attribute from <interfaceDefinition>

It's problematic for multiple reasons:
1. It's plaintext and is hard to verify
2. If it's wrong, it may have a very "interesting" effect on the
   resulting reference tree, such as lots of misplaced nodes
3. It's hardly ever needed as most nodes only go one or two levels deep
   in VyOS, such as "service $something" or "interfaces $something",
   and I think it's unlikely that other appliances will differ much.

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