Automatic merge from submit-queue (batch tested with PRs 39826, 40030)

azure disk: restrict length of name

**What this PR does / why we need it**:
Fixes dynamic disk provisioning on Azure by properly truncating the disk name to conform to the Azure API spec.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
n/a

**Special notes for your reviewer**:
n/a

**Release note**:
```release-note
azure disk: restrict name length for Azure specifications
```

cc: @rootfs