Add 'Resource' definition in common types

Author: anat-gilenson

specification/securityinsights/resource-manager/common/1.0/types.json

@@ -36,7 +36,21 @@
       "x-ms-external": true
     },
     "ResourceWithEtag": {
+      "allOf": [
+        {
+          "$ref": "#/definitions/Resource"
+        }
+      ],
       "description": "An azure resource object with an Etag property",
+      "properties": {
+        "etag": {
+          "description": "Etag of the azure resource",
+          "type": "string"
+        }
+      }
+    },
+    "Resource": {
+      "description": "An azure resource object",
       "properties": {
         "id": {
           "description": "Azure resource Id",
@@ -53,10 +67,6 @@
           "readOnly": true,
           "type": "string"
         },
-        "etag": {
-          "description": "Etag of the azure resource",
-          "type": "string"
-        },
         "systemData": {
           "readOnly": true,
           "type": "object",