When looking at building the generator for regalloc, we realized we'd need quite a bit of custom logic, and that perhaps it'd be easier to just have each usecase (each kind of mlgo policy) have it's own stand-alone test generator. This patch just consolidates the old `config.py` and `generate_mock_model.py` into one file, and does away with subdirectories under Analysis/models.  | 
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| gen-inline-oz-test-model.py | ||