Test Instance Manager IP Sync

Test step:

  1. Launch longhorn system
  2. Create and attach a volume
  3. Follow this doc to manually modify the IP of one instance-manager-r. e.g., 
    curl -k -XPATCH -H "Accept: application/json" -H "Content-Type: application/merge-patch+json" -H "Authorization: Bearer kubeconfig-xxxxxx" --data '{"status":{"ip":"1.1.1.1"}}' https://172.104.72.64/k8s/clusters/c-znrxc/apis/longhorn.io/v1beta1/namespaces/longhorn-system/instancemanagers/instance-manager-r-63ece607/status
    1. Notice that the bearer token kubeconfig-xxx can be found in your kube config file
    2. Remember to add /status at the end of the URL
  4. Verify the IP of the instance manager still matches the pod IP
  5. Verify the volume can be detached.
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