Remove pyOpenSSL dependency

[gcoxmoz]

Description

The pyOpenSSL module in duo_universal_python does not appear to be referenced.

Motivation and Context

This change seeks to remove an unused module to reduce dependencies / attack surface.

How Has This Been Tested?

Skimmed the code looking for why it's needed, found nothing. Ran the test suite, it continued to pass.

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] None of the above?