fix TestIsCorruptedDir unit test on Windows

[andyzhangx]

Is your feature request related to a problem?/Why is this needed

Describe the solution you'd like in detail

unit test TestIsCorruptedDir could pass in admin mode on Windows:

>go test -run TestIsCorruptedDir
--- FAIL: TestIsCorruptedDir (0.00s)
    azuredisk_test.go:555: failed to create curruptedPath: symlink C:\Users\xiazhang\AppData\Local\Temp\csi-mount-test769943179 C:\Users\xiazhang\AppData\Local\Temp\csi-mount-test769943179\curruptedPath: A required privilege is not held by the client.

related to bug: golang/dep#773

more details refer to #522 (comment)

Describe alternatives you've considered

Additional context

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