HOT for MSSQL Server 2012 R2 with unit tests

It deploys a MSSQL Server 2012 R2 instance.
The MSSQL ISO file is copied from an SMB share.

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

Change-Id: If2b024d7717e2846bb199e950c314ce9c9d778e7
Partially-Implements: blueprint windows-instances