Valdate certificate before overwriting #9
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So far the
acme-tinyoutput has been overwriting existing certificates during execution. This resulted in an empty file if the command failed. This meant that a valid certificate was replaced with an empty file resulting in a denial of service on restart of most TLS services depending on that certificate.Now we will write the new certificate in a temporary file, validate it to be a x509 certificate and then only overwrite the old certificate. Additionally a backup copy of the old certificate is made by default.