resize Azure disk issue when it's in attached state

[andyzhangx]

What happened:
resize Azure disk issue when it's in attached state:

{
  "innererror": {
    "internalErrorCode": "ChangeDiskSizeWhileAttachedNotAllowed"
  },
  "code": "OperationNotAllowed",
  "message": "Cannot resize disk kubernetes-dynamic-pvc-b4c75dc7-16bd-442f-be19-b0a81441fa84 while it is attached to running VM /subscriptions/xxx/resourceGroups/benny-aks-resources/providers/Microsoft.Compute/virtualMachineScaleSets/aks-linux-31091033-vmss/virtualMachines/aks-linux-31091033-vmss_5. Resizing a disk of an Azure Virtual Machine requires the virtual machine to be deallocated. Please stop your VM and retry the operation."
}

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Network plugin and version (if this is a network-related bug):
• Others:

/priority important-soon
/sig cloud-provider
/area provider/azure
/triage accepted
/kind bug
/assign