OpenSSL serialized test files from Bouncy Castle

From https://github.com/bcgit/bc-java/tree/9b2feda/pkix/src/test/resources/org/bouncycastle/openssl/test/data

Password for encrypted files is "changeit"

I'm not entirely sure I want to land this yet. If it is merged I'll use it to test encryption algorithms other than AES for OpenSSL serialisation. I don't particularly want to force any requirements on backends to support some of the more exciting ciphers though so we'd need to figure out how that would work first.