Add host, schemes, comsumes and produces (Azure#18668)

Author: jinghzhu-msft

specification/dashboard/resource-manager/Microsoft.Dashboard/preview/2021-09-01-preview/grafana.json

@@ -5,6 +5,16 @@
     "description": "The Microsoft.Dashboard Rest API spec.",
     "version": "2021-09-01-preview"
   },
+  "host": "management.azure.com",
+  "schemes": [
+    "https"
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
   "paths": {
     "/providers/Microsoft.Dashboard/operations": {
       "get": {