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Add availability zones support to Azure managed disks
**What this PR does / why we need it**:
Continue of [Azure Availability Zone feature](https://github.com/kubernetes/features/issues/586).
This PR adds availability zone support for Azure managed disks and its storage class. Zoned managed disks is enabled by default if there are zoned nodes in the cluster.
The zone could also be customized by `zone` or `zones` parameter, e.g.
```yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
annotations:
name: managed-disk-zone-1
parameters:
zone: "southeastasia-1"
# zones: "southeastasia-1,"southeastasia-2"
cachingmode: None
kind: Managed
storageaccounttype: Standard_LRS
provisioner: kubernetes.io/azure-disk
reclaimPolicy: Delete
volumeBindingMode: Immediate
```
All zoned AzureDisk PV will also be labeled with its availability zone, e.g.
```sh
$ kubectl get pvc pvc-azuredisk-az-1
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
pvc-azuredisk-az-1 Bound pvc-5ad0c7b8-8f0b-11e8-94f2-000d3a07de8c 5Gi RWO managed-disk-zone-1 2h
$ kubectl get pv pvc-5ad0c7b8-8f0b-11e8-94f2-000d3a07de8c --show-labels
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE LABELS
pvc-5ad0c7b8-8f0b-11e8-94f2-000d3a07de8c 5Gi RWO Delete Bound default/pvc-azuredisk-az-1 managed-disk-zone-1 2h failure-domain.beta.kubernetes.io/region=southeastasia,failure-domain.beta.kubernetes.io/zone=southeastasia-1
```
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
See also the [KEP](https://github.com/kubernetes/community/pull/2364).
DynamicProvisioningScheduling feature would be added in a following PR.
**Release note**:
```release-note
Azure managed disks now support availability zones and new parameters `zoned`, `zone` and `zones` are added for AzureDisk storage class.
```
/kind feature
/sig azure
/assign @brendandburns @khenidak @andyzhangx
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