message: Add managedIdentityResourceId to EventHubConnectionProperties
diff: "provisioningState": {
  "$ref": "#/definitions/ResourceProvisioningState",
  "description": "The provisioned state of the resource."
  + },
  + "managedIdentityResourceId": {
  + "type": "string",
  + "description": "The resource ID of a managed identity (system or user assigned) to be used to authenticate with event hub."
  }
  },
  "required": [
  