Function log_cert_data 

pub(crate) fn log_cert_data(cert: &OpenpgpCert) -> String

Creates a representative string for logging from an OpenpgpCert.

The returned string is of the form “fingerprint (verifier)” where “fingerprint” is the primary key fingerprint of the certificate and “verifier” is a list of one or more verifier locations from which the certificate has been assembled.