* use json.RawMessage to remote mapstructure in options
* use vault secretid structure to support multiple source aka string, file and env
* remove log prefix
* return raw cert on error on newline for cert and csr
* clean sans, commonName in createCertificate (bad copy/paste from StepCAS)
* verify authority fingerprint
* convert serial on revoke to bigint, bytes and vault dashed representation
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