Add a server with volumes ResourceGroup example

Adds an example in response to a ML question, shows how you can
create a resource group containing a number of nested stacks containing
identical volumes and volume attachment resources, then pass in the
server ID to have the volumes attached to one server.

Also moves the current basic example into a resource_group subdirectory,
so we can collect related examples, and make more obvious that the
volume_with_attachment template is part of another example rather than
a standalone example template.

Change-Id: I1ffc1656286a981b6dc219038e03adbb8d5af775
HOT for MSSQL Server with unit tests

It deploys an MSSQL Server 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
Merge "Add a server with volumes ResourceGroup example"
Merge "HOT for MSSQL Server with unit tests"