Fix how the signer calls the auditor

The auditor is an optional component of OpenDNSSEC and the configuration file can specify that it not be run. If the auditor is configured to run, the signer writes its output to an auditor directory and the auditor, on successful completion of the audit, moves it to the "signed" directory. If the auditor is not configured to run, the signer writes its output directly to the "signed" directory.

Need to define where the "auditor" and "signed" folders are?