* openssl_pkcs12: Add support for `certificate_content` and `other_certificates_content`
Co-authored-by: Felix Fontein <felix@fontein.de>
* Added minimal tests.
The tests are minimal because internally it always ends up with the
_content variants, so even when supplying a file most of the internal
code paths then use the content.
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Co-authored-by: Felix Fontein <felix@fontein.de>