Simplified the manifest a bit
Simplified the manifest a bit

Added a private check, removed an extraneous variable, bumped the `$ensure` variable calculation outside the conditional so it will apply to both, if we ever do the same for windows.
puppetlabs/pltraining-classroom,binford2k/pltraining-classroom,carthik/pltraining-classroom,fnaard/pltraining-classroom,binford2k/pltraining-classroom,fnaard/pltraining-classroom,puppetlabs/pltraining-classroom,fnaard/pltraining-classroom,carthik/pltraining-classroom,carthik/pltraining-classroom,binford2k/pltraining-classroom,puppetlabs/pltraining-classroom