fix freeradius-client package names in hammer.py

Hammer outputs the names of the freeradius-client packages with the rest of the package names when building packages. This tells our packaging scripts which packages can be uploaded to cloudsmith.

But the name of the packages is wrong. For instance, for one Debian repo, it's written as libfreeradius-client=1.1.7-isc20220608134906 instead of libfreeradius-client_1.1.7-isc20220608134906_amd64.deb. It's similar for RPM.

Uploading of freeradius-client packages is only required once on the public repos, but even so, this automation saves that effort.

It's more important for the prv-testing repos which are used for sanity checking. There, we delete all packages monthly including the freeradus-client packages. So they need to be uploaded each time.