Fix ModelTestUtils to work with transformations that modify the model

This involved:
Make MTU.checkFailedTransformedBootOperations() use the original operation as the basis for further testing (previously it was using the transformed op, which hid some issues)
Making a saner version of FailedOperationTransformationConfig.ChainedConfig
Making the FailedOperationTransformationConfig.PathAddressConfig hierarchy a bit easier to work with
Sometimes expressions were not being set by parsers
Fix ListAttributeDefinition parsing
Revisit some of the subsystem parsers and tests following the changes