Added Puppet Agent HOT

It deploys an instance with the latest Puppet Windows Agent.
The Puppet Agent installer is downloaded from the puppetlabs.com

The unit tests for the powershell module(user data scripts) are written
using Pester 3.0

Change-Id: Ia9449ad52e02622d41724c2b6c0680d1066d60e6
Partially-Implements: blueprint windows-instances