Kubernetes Submit Queue f34a24e98e Merge pull request #52401 from andyzhangx/azuredisk-getdevfunc ...

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fix warning messages due to GetMountRefs func not implemented in windows

**What this PR does / why we need it**:
This PR completes the windows implementation of GetMountRefs in mount.go. In linux, the GetMountRefs implementaion is: read `/proc/mounts` and find all mount points, while in Windows, there is no such `/proc/mounts` place which shows all mounting points. 
There is another way in windows, **we could walk through(by `getAllParentLinks` func) the mount path(symbolic link) and get all symlinks until we got the final device, which is actually a drive**.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #54670
This PR fixed the warnning issue mentioned in https://github.com/kubernetes/kubernetes/pull/51252

**Special notes for your reviewer**:
Some values in the code would be like follwoing:
```
GetMountRefs: mountPath ("\\var\\lib\\kubelet\\pods/4c74b128-92ca-11e7-b86b-000d3a36d70c/volumes/kubernetes.io~azure-disk/pvc-1cc91c70-92ca-11e7-b86b-000d3a36d70c")
getAllParentLinks: refs (["" "" "c:\\var\\lib\\kubelet\\plugins\\kubernetes.io\\azure-disk\\mounts\\b1246717734" "G:\\"])
basemountPath c:\var\lib\kubelet\plugins\kubernetes.io\azure-disk\mounts
got volumeID b1246717734
```

**Release note**:

```
fix warning messages due to GetMountRefs func not implemented in windows
```

2017-10-27 20:28:36 -07:00

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