* 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.
* Rename identify.py to pem.py.
* Move split PEM list code to pem.py crypto module_utils.
* Extend and use global certificate splitting code in acme_certificate.
* openssl_pkcs12: allow to load multiple certificates from files mentioned in other_certificates.
* Add changelog and module_utils redirect.
* Remove old check.
* Fix typo.
* Apply suggestions from code review
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>
* Add example.
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>