RPM Support

I have a package exclusion filter in Katello to reject newer kernels for which I don't yet have compatible versions of out-of-tree modules, but I end up with the latest versions of the perf and kernel-tools packages because they are listed in the @performance and @core package groups, respectively.

So I'd like to propose that package groups only cause a package to be added if some version of the package wasn't already requested. I'm working on a patch.

I will also say, FWIW, that I wasn't expecting these sort of additions to be processed without depsolving enabled, such that my initial line of investigation started with the assumption that I must be accidentally enabling it somehow.