Update python
Update python

Changes:

- https://github.com/docker-library/python/commit/428fed6: Merge pull request https://github.com/docker-library/python/pull/700 from infosiftr/pip-no-compile
- https://github.com/docker-library/python/commit/f42cd53: Set PYTHONDONTWRITEBYTECODE and use "--no-compile" during pip install/test
- https://github.com/docker-library/python/commit/be26fbe: Merge pull request https://github.com/docker-library/python/pull/697 from felipecrs/remove-coreutils
- https://github.com/docker-library/python/commit/597b1f2: Remove coreutils package from build dependencies

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