Refs #6927 - remove pulp capsule validation from the puppet functions

The logic was moved to pre_validations kafo hooks
The question is why we should allow that? I'm not aware of a real use-case when one would want to do that. It complicates the whole setup and I'm not willing to spend any time debugging the installer to support this case (I don't think it will work out of the box), unless there will be a real use-case for doing so