message: [AKS] note that only one agent pool is currently supported
diff: "items": {
  "$ref": "#/definitions/ManagedClusterAgentPoolProfile"
  },
  - "description": "Properties of the agent pool."
  + "description": "Properties of the agent pool. Currently only one agent pool can exist."
  },
  "linuxProfile": {
  "$ref": "#/definitions/ContainerServiceLinuxProfile",
  