* 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.
* Use B(...) instead of RST formatting (which does not work for options).
* Improve the documentation on acme_directory.
It now mentions the ACME v1 deprecation for Let's Encrypt,
and mentions that ZeroSSL works.
* Improve ACME module documentation.
* Update plugins/doc_fragments/acme.py
* Move disk-independent parts of openssl_privatekey to module_utils and doc_fragments.
* Improve documentation.
* Add openssl_privatekey_pipe module.
* Fallback in case no fingerprints are returned.
* Prevent no_log=True for content to stop module from working correctly.
* Forgot version_added.
* Update copyright. All the interesting code is no longer in this file anyway.
* Remove file arguments.
* Add framework for action modules.
* Convert openssl_privatekey_pipe to action plugin.
* Linting.
* Bump version.
* Add return_current_key option.
* Add no_log to examples.
* Remove preparation for potential later extensibility (easy to re-add when needed).
* Fix deprecation version in docs.
* Use new ArgumentSpec object for AnsibleActionModule as well.
Felix Fontein