Merge pull request #62467 from andyzhangx/nsenter-getfiletype-fix

Automatic merge from submit-queue (batch tested with PRs 62467, 62482, 62211). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

fix nsenter GetFileType issue in containerized kubelet

**What this PR does / why we need it**:
UnmountDevice would fail in containerized kubelet in v1.9.x, and in the end, pod with volume mount could not be scheduled from one node to another since the original volume will never be released. This PR fixed this issue.

In [nsenter_mount.GetFileType func](https://github.com/kubernetes/kubernetes/blob/master/pkg/util/mount/nsenter_mount.go#L238), return error of following code will be different than [mount_linux.GetFileType func](https://github.com/kubernetes/kubernetes/blob/master/pkg/util/mount/mount.go#L347)
```
outputBytes, err := mounter.ne.Exec("stat", []string{"-L", `--printf "%F"`, pathname}).CombinedOutput()
```
Return error and output would be like following in nsenter_mount.GetFileType func:
error: `exit status 1`
output: `/usr/bin/stat: cannot stat '2': No such file or directory`

This PR makes the return error consistent as mount_linux.GetFileType func, and finally makes [isDeviceOpened func](https://github.com/kubernetes/kubernetes/blob/master/pkg/volume/util/operationexecutor/operation_generator.go#L1340) work.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #62282

**Special notes for your reviewer**:
/assign @dixudx 

**Release note**:

```
fix nsenter GetFileType issue in containerized kubelet
```

/sig node

pkg/util/mount/nsenter_mount.go

@@ -235,8 +235,13 @@ func (n *NsenterMounter) MakeRShared(path string) error {
 
 func (mounter *NsenterMounter) GetFileType(pathname string) (FileType, error) {
 	var pathType FileType
-	outputBytes, err := mounter.ne.Exec("stat", []string{"-L", `--printf "%F"`, pathname}).CombinedOutput()
+	outputBytes, err := mounter.ne.Exec("stat", []string{"-L", "--printf=%F", pathname}).CombinedOutput()
 	if err != nil {
+		if strings.Contains(string(outputBytes), "No such file") {
+			err = fmt.Errorf("%s does not exist", pathname)
+		} else {
+			err = fmt.Errorf("stat %s error: %v", pathname, string(outputBytes))
+		}
 		return pathType, err
 	}