* Fix empty check for openssl_pkcs12 tests.
* Remove unnecessary imports.
* Prevent crash if PyOpenSSL cannot be imported because of an AttributeError.
* Add changelog fragment.
* Fix constraints file.
* Use Python 2.7 instead of 3.5 for 2.9 cloud tests (pip module is broken).
* Prevent upgrading cryptography on ansible-core 2.12's default container with Python 3.9.