* Added idempotency logic to openssl_pkcs12
Also decoupled the 'parse' and 'generate' function from the file write
as they are now used in different places that do not need the file to be
written to disk.
* Added idempotency tests for openssl_pkcs12
Also adds a new test for pkcs12 files with multiple certificates
* Regenerate if parsed file is invalid
* pkcs12_other_certificates check was wrong
* Updated ca_certificates to other_certificates
ca_certificates is left as an alias to other_certificates;
friendlyname depends on private key, so it will be ignored while
checking for idempotency if the pkey is not set;
idempotency check only checks for correct certs in the stack
* use different keys for different certs
* Added other_certificates in module docs
* Added changelog and porting guide
* removed unrelated porting guide entry
* renamed ca_cert* occurrence with other_cert
* Removed required_together, updated tests
Since required_together: privatekey_path -> friendly_name, is not always
required it has been removed.
Updated openssl_pkcs12 integration tests to be in line with other
openssl_* modules, and added a test for export with no privatekey_path.
* linter fixes
* Removed cryptography from tests
* Added changelog fragment
* Removed non-necessary select_crypto_backend
