* 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.
* Use module_utils from collection, clean up code a bit
* add DSA keys, because why not...
* sign/verify was added in pyOpenSSL 0.11 apparently
* Add signing capability detection to module_utils.crypto.basic
* Rework feature detection of signature types.
* Rename parameters to match other modules
* Add initial version of integration tests
* fix whitespace in tests
* More whitespace fixes
* small fixes for issues in testing
* Organize integration tests as test matrix
* another indentation fix to make pep8 happy
* use openssl pkeyutl when possible, otherwise fall back to openssl dgst
* More linter fixes
* openssl pkeyutl -help can apparently return 1
* ignore errors on openssl call and another try at formatting
* Remove the OpenSSL calls in tests
* Add collection name to deprecation notice and deprecate at version 2.0.0
* Exclude Ed448/25519 tests on pyopenssl
* revert the collection name in the deprecation notice (breaks 2.9)
* limit test platforms even more
* disable FreeBSD DSA and ECC tests
* Add module name to README
* rewrite and split into 2 modules instead
* add module to README and fix whitespace issue
* remove duplicated tests
* address review remarks
* resolve another comment
