In preparation for adding a varlink interface for key management, add support for signing reports with multiple TPM2 keys. During signing, this iterates over all *.key files in /var/lib/systemd/report.sign.tpm2, generating a TPM signature with each one. It also looks for the corresponding *.voucher file, containing some credential that is used to prove that the signing key is authentic, and which is added to the signature if it exists. If no signing keys exist when a signature is requested, a default signing key is still created as default.key.
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