Extend DSC provisioner to include Custom Scripts

[Badgerati]

The only provisioner right now is DSC, aim for this issue is to extend DSC section to be a Provisioner section which include DSC and Custom Scripts. Something like:

"provisioners": {
    "remoting": "dsc: .\\Remoting.ps1",
    "web": "custom: .\\WebServer.ps1"
}

Then in the VM section, instead of having a DSC array of keys, it's a Provisioners array of keys:

"vms": [
    {
        ...,
        "provisioners": [
            "remoting"
        ],
        ...
    }
]

The rest wil be taken care of by Fogg; so publishing DSC scripts, and creating context/containers for custom scripts.

• http://www.techdiction.com/2016/02/12/create-a-custom-script-extension-for-an-azure-resource-manager-vm-using-powershell/
• https://github.com/juliajauss/InstallCustomScriptExtension/blob/master/Install-CustomScriptExtension.ps1