2946

Reorganize build system to minimize duplication while handling 3
scenarios:

1. Locally running tests with `mu test`
2. Locally running tests until some layer with `build_and_test_until`
3. Running on Linux with `test_layers`
4. Running on Travis CI with multiple sharded calls to `test_layers`

One thing we drop at this point is support for OSX in test_layers. We
don't need it now that we have Travis CI working.

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