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Deprecate PytestRun env vars.

This adds standard @deprecated support for any access to env vars in
place of the equivalent options via a class decorator that generates a
pair of methods for each env/replacement-option pair.

Along the way it fixes a bug where `--coverage` was being exported but
not honored.

Testing Done:
Manually tested that advancing the version to `0.0.35` triggered
the expected error when running:
```console
$ PANTS_DEV=1 ./pants compile compile src/python/pants/backend/python/tasks/:python
```

CI went green here:
  https://travis-ci.org/pantsbuild/pants/builds/64960654

Bugs closed: 1618

Reviewed at https://rbcommons.com/s/twitter/r/2299/

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