(FACT 614) Add structured operatingsystem fact

The first of these commits adds the 'operatingsystem_hash' (name very much pending) structured fact, which incorporates all operatingsystem-related facts into a nested hash. Includes keys for the equivalents of operatingsystem, osfamily, operatingsystemrelease, operatingsystemmajrelease, and the six lsb facts for Linux systems.

The second commit refactors the previously mentioned existing flat facts to resolve by using values from the new 'operatingsystem_hash' structured fact. This ensures that these facts will stay in sync with the new fact, while also maintaining backwards compatibility.
I think we can remove the confines for the flat facts and rely on the confine behavior of the structured fact.  Thus, the flat facts simply become a translation on the structured fact data if present and should not resolve if not present.  This will keep a single source of truth on the confine logic in the structured fact.