Make package inventory actually sync

In pe-puppetdb the :package_inventory "fact" is included in the fact data when its hash is generated but package information is then stored and queried on its own. The result is that if a fact needs to be synced to another PuppetDB, the package inventory will not be synced and the resulting fact hash will be different between the PuppetDBs. Then roughly ~50% of those factsets with mismatched hashes will sync every sync run.

This was seen in a customers infrastructure in PDB-4072 as the HA being out of sync after a restart because while the primary PuppetDB was down facts were still being submitted to the secondary PuppetDB, so when the primary came back online it synced those facts and generated the wrong hash.