Added x-ms-azure-resource for TrackedResource, and added default valu…

…es for 2 enums. (#2953)

* Initial placeholder for 2018-05-01-preview version using the contents of 2018-01-01 version.

* Changes for the 2018-05-01-preview version.

* Added StorageBlobDeadLetterDestination.

* Added an additional enum value CloudEventV01Schema.

* Added InputSchema to topic properties.

* Tagging endpointType a required property in deadletterdestination.

* Added x-ms-azure-resource for TrackedResource, and added some default values.

specification/eventgrid/resource-manager/Microsoft.EventGrid/preview/2018-05-01-preview/EventGrid.json

@@ -1532,7 +1532,8 @@
                     "x-ms-enum": {
                         "name": "EventDeliverySchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "retryPolicy": {
                     "$ref": "#/definitions/RetryPolicy",
@@ -1847,7 +1848,8 @@
                     "x-ms-enum": {
                         "name": "EventDeliverySchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "retryPolicy": {
                     "$ref": "#/definitions/RetryPolicy",
@@ -1977,7 +1979,8 @@
                     "x-ms-enum": {
                         "name": "InputSchema",
                         "modelAsString": true
-                    }
+                    },
+                    "default": "EventGridSchema"
                 },
                 "inputSchemaMapping": {
                     "$ref": "#/definitions/InputSchemaMapping",
@@ -2101,7 +2104,8 @@
                         "type": "string"
                     }
                 }
-            }
+            },
+            "x-ms-azure-resource": true
         },
         "Topic": {
             "description": "EventGrid Topic",