Update the update_package_info script to include other releases than rawhide

Some packages in pkgdb are actually only active in EPEL and have been
dropped from rawhide while still being present in other active branch
of Fedora. So by checking more than just rawhide we should be able to
update the information about most if not all packages in pkgdb.

We are careful though that information coming from rawhide do not get
overridden by older branches.
Let's be a little more explicit about what which version we are checking

This way it is also very clear that only rawhide is processed differently
which means, rawhide must always be the first element in the list
Merge pull request #114 from fedora-infra/expand_updates

Update the update_package_info script to include other releases than raw...