Azure disk: storage class should support the sku if the storage accout support it

[weherdh]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug

/kind feature

What happened:
Now for storage class only support skuName with Premium_LRS and Standard_LRS
Met error if the storage account was created with other sku. But actually it can work well without setting it

What you expected to happen:
skuName should support others if the storage account support it

How to reproduce it (as minimally and precisely as possible):
Create a storage account which is using Standard_RAGRS sku. Create storage class as below:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: scazure
parameters:
  location: eastus
  skuName: Standard_RAGRS
  storageAccount: storage
provisioner: kubernetes.io/azure-disk

Create pvc as below

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    volume.beta.kubernetes.io/storage-class: scazure
  name: azpvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

PVC would never bind with below error:
Failed to provision volume with StorageClass "scazure": azureDisk - Standard_RAGRS is not supported sku/storageaccounttype. Supported values are [Premium_LRS Standard_LRS]

But if I remove the skuName parameter, the pvc could be bound

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: scazure
parameters:
  location: eastus
  storageAccount: storage
provisioner: kubernetes.io/azure-disk

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
  Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.6+a08f5eeb62", GitCommit:"c84beff", GitTreeState:"clean", BuildDate:"2017-11-12T02:22:57Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
  Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.6+a08f5eeb62", GitCommit:"c84beff", GitTreeState:"clean", BuildDate:"2017-11-12T02:22:57Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}

• Cloud provider or hardware configuration:

• OS (e.g. from /etc/os-release): RHEL7

• Install tools: ansible

[weherdh]

/assign andyzhangx

[weherdh]

/sig azure

[andyzhangx]

thanks, it's a requirement, we should support Standard_LRS, Standard_ZRS, Standard_GRS, Standard_RGRS, while for premium, it only support Premium_LRS

[andyzhangx]

/kind feature

[andyzhangx]

Standard_ZRS, Premium_GRS are not supported for azure disk now