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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add initial availability zones support for Azure nodes **What this PR does / why we need it**: The first part of [Azure Availability Zone feature](https://github.com/kubernetes/features/issues/586). This PR adds initial availability zone (AZ) support for Azure nodes. With this PR, Azure nodes with AZ will have label `failure-domain.beta.kubernetes.io/zone=<region>-<zoneID>`, e.g. `southeastasia-1`. It also updates instance metadata api-version to 2017-12-01, which is required for AZ. **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**: VirtualMachineScaleSetVM doesn't have AZ info yet. It will be supported later after new Azure Go SDK releases. **Release note**: ```release-note Azure nodes with availability zone now will have label `failure-domain.beta.kubernetes.io/zone=<region>-<zoneID>`. ``` /kind feature /sig azure /assign @brendandburns @khenidak @andyzhangx