chage case in osversion in JSON

Author: knithinc

CanaryValidator/azuredeploy.json

@@ -34,12 +34,12 @@
         },
         "windowsOSVersion": {
             "type": "string",
-            "defaultValue": "2016-DataCenter-Core",
+            "defaultValue": "2016-Datacenter-Core",
             "allowedValues": [
                 "2008-R2-SP1",
                 "2012-Datacenter",
                 "2012-R2-Datacenter",
-                "2016-DataCenter-Core"
+                "2016-Datacenter-Core"
             ],
             "metadata": {
                 "description": "The Windows version for the VM. This will pick a fully patched image of this given Windows version. Allowed values: 2008-R2-SP1, 2012-Datacenter, 2012-R2-Datacenter."