There was a change in how koji tags were used last week and it's causing a lot of task failures because we're now triggering on a lot of invalid koji tags.

With the new signing setup, they're using tags like 'f25-signing-pending' which hit our filter of "*-pending" and trigger jobs which have invalid koji tags.

Rework the koji tag listener to be more selective of what it's listening for so that we're not triggering on the *-signing-pending" tag events.