(PUP-1640) Remove unused puppet model checker for catalog side effects

This removes the checker that is intended to check a puppet language
model for catalog side effects since it is not yet used. It can be added
again when functions written in the puppet language is added.
(PUP-1640) Fix formatting, typos, etc. found in review

* This removes the data.pp mentioned as the manifest in the
environment.conf file (unused and wrong)
* Typos in comments
* missing end of line on the last line in some source files.