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Required for rebase of python-cryptography.

The differences between 0.9.8 (in RHEL 7) and 1.1 (requested here) are, according to [0], some backwards-incompatible changes and not many relevant improvements.

What's the reason python-cryptography can't use 0.9.8? Is it the proxy support in VerifyingHTTPSConn?

Since setuptools are used to install a lot of Python packages, I'm quite worried about the incompatible changes.

[0] https://pythonhosted.org/setuptools/history.html#id146

Turns out this isn't actually needed. They upgraded their requirement to 1.0 to use TLS validation when downloading packages at build time. We don't do that, so it is irrelevant to us. We will patch python-cryptography to use the older version of setuptools.