Pytest-localstack

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- Fix exclusion of tests from installed packages.

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- Add CloudWatch Logs service.

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- Use botocore to determine default AWS region (will us-east-1 fallback).
- Replace use of `pytest.config` with `pytest_configure()` hook.

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- Fix a bug involving our patched botocore Session trying to access `_internal_components` and getting `_components` instead.

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- Fix pinned install requirements conflict between pytest and pluggy.

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- Fix for botocore >= 1.10.58.