* 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.
* Improve openssh_* tests.
* Use 2048 instead of 4096 bit keys in many places.
ci_complete
* Parameterize default RSA key length for tests.
* Reduce default RSA key size to 1024.
ci_complete
* Fix error.
ci_complete
* Use variable more often.
* Use 2048 bits for RSA keys for certificates on RHEL8 and CentOS8.
ci_complete
* Fix missing constant.
ci_complete
* Print default key sizes.
* 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.
