* Remove Ubuntu 16.04 (Xenial Xerus) from CI.
* Removing PyOpenSSL backend from everywhere but openssl_pkcs12.
* Remove PyOpenSSL support from module_utils that's not needed for openssl_pkcs12.
* Add changelog fragment.
* Add openssl_publickey_info module. Share code between openssl_privatekey_info and the new module, and improve documentation of it.
* Move public key loading to support module.
* Require pyOpenSSL 16.0.0 for public key loading.
* Linting.
* Apply suggestions from code review
Co-authored-by: Ajpantuso <ajpantuso@gmail.com>
Co-authored-by: Ajpantuso <ajpantuso@gmail.com>