…and nodes

if there is insufficient storage. Output now looks like:

```
{
  "Name": "minikube",
  "StatusCode": 507,
  "StatusName": "InsufficientStorage",
  "StatusDetail": "/var is almost out of disk space",
  "Step": "Starting Node",
  "StepDetail": "Updating the running docker \"minikube\" container ...",
  "BinaryVersion": "v1.12.3",
  "Components": {
    "kubeconfig": {
      "Name": "kubeconfig",
      "StatusCode": 500,
      "StatusName": ""
    }
  },
  "Nodes": [
    {
      "Name": "minikube",
      "StatusCode": 507,
      "StatusName": "InsufficientStorage",
      "Components": {
        "apiserver": {
          "Name": "apiserver",
          "StatusCode": 405,
          "StatusName": "Stopped"
        },
        "kubelet": {
          "Name": "kubelet",
          "StatusCode": 405,
          "StatusName": "Stopped"
        }
      }
    }
  ]
}
```

Make sure that if /var has full storage, the output of `minikube status` is correct regardless of whether events.json is present or not

…var-status-code