Automatic merge from submit-queue (batch tested with PRs 59489, 59716). 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 AzureDisk support for vmss nodes

**What this PR does / why we need it**:

This PR adds AzureDisk support for vmss nodes. Changes include

- Upgrade vmss API to 2017-12-01
- Upgrade vmss clients with new version API
- Abstract AzureDisk operations for vmss and vmas
- Added AzureDisk support for vmss
- Unit tests and fake clients fix
 
**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 #43287

**Special notes for your reviewer**:

~~Depending on #59652 (the first two commits are from #59652).~~

**Release note**:

```release-note
Add AzureDisk support for vmss nodes
```