In preparation for certificate integrity-checking: invalid certificate
chains and mismatching private keys will no longer be allowed anywhere
in Lemur code.
The test vector certs were generated using the Lemur "cryptography"
authority plugin.
* Certificates are now more similar to real-world usage: long serial
numbers, etc.
* Private key is included for all certs, so it's easy to re-generate
anything if needed.
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