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Fix format specifiers in Azure cloud provider

**What this PR does / why we need it**: Fixes invalid/mismatched format specifiers in Azure cloud provider logging statements (`glog...Infof(...)`) that would cause information to be lost in logging output, as flagged by `go vet`.

**Which issue this PR fixes**: None

**Special notes for your reviewer**: None

**Release note**:

```release-note
NONE
```