- rename ProposedNewObject to ProposedNew:
Now that there is an actual configschema.Object it will be clearer if
the function names match the type the act upon.
- extract attribute-handling logic from assertPlanValid and extend
A new function, assertPlannedAttrsValid, takes the existing
functionality and extends it to validate attributes with NestedTypes.
The NestedType-specific handling is in assertPlannedObjectValid, which
is very similar to the block-handling logic, except that nulls are a
valid plan (an attribute can be null, but not a block).
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