Validation of Nulecule files within Atomic App

[dustymabe]

Right now we don't validate that Nulecule files match the spec when we start an Atomic App. We should start validating them which will cause app devs to catch problems faster and consumers to detect corruption faster.

There is already a nulecule validator that exists that was written for Dev Assistant. We can leverage this and create a library out of it that we can use within Atomic App.

A few things we need:

• The schema from the Nulecule Spec to be accessible (most likely in rpm form)
• The library from the nulecule validator to be accessible (most likely in rpm form)
• Atomic App to leverage those two to validate Nulecule files.