[Python-buildbots] Request: Add AIX 7.3 buildbot worker

Greetings!

IBM would like to add an AIX 7.3 worker to the existing AIX 7.2 worker. We suggest

edelsohn-aix73-ppc64

as the name. Could this be added to the worker configuration and then I can issue a pull request for the configuration of the builders. The system will be hosted at OSUOSL, as with the current worker.

Thanks, David