Replace Puppet inventory API

[ZeroPointEnergy]

This is something for post 3.0 release. Puppet Dashboard displays facts of nodes if the Puppet inventory service is configured. Newer versions of Puppet no longer support this API endpoint as it was all moved to the PuppetDB.

If we want to display facts there are basically two routes we could take:

• Get facts from the PuppetDB API.
• Allow uploading of facts similar to how Foreman does it.

Or we could simply remove the feature entirely. WDYT?