Automatic merge from submit-queue

azure disk: add logging on disk attach

**What this PR does / why we need it**:
While we were debugging a failed azure disk attach, we were missing logging information to identify the root cause. This fix logs information at each stage of attach to help identify where problem is once it happens again.

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

**Special notes for your reviewer**:

**Release note**:

NONE