If I have a list of RPMs and I want to make sure they're all signed, my client must look up the individual RPM ID numbers with a series of getRPM calls, and then pass those ID numbers into queryRPMSigs.

For example, the koji list-signed command does this for RPMs. When the user passes an RPM name to list-signed, the CLI calls getRPM in order to get the rpm ID, and then passes that into queryRPMSigs.

It would be more efficient if callers could pass RPM names into queryRPMSigs.

(For backwards compatibility, we need to be careful around string handling here. For example, what happens when I pass a string-ify'd int today?)