Update to DW Gen2

[chmitch]

I'd recommend updating your lab to use SQL DW gen 2. The arm api has been updated to allow this. Your arm would need to update to the following:

    {
      "type": "databases",
      "name": "AirlinePerformance-DW",
      "apiVersion": "2017-10-01-preview",
      "location": "[resourceGroup().location]",
        "sku": {
            "name": "DW100c",
            "tier": "DataWarehouse"
        },
      "properties": {
        "collation": "SQL_Latin1_General_CP1_CI_AS"
      },