Merge pull request #57779 from jolestar/flex-volume-fix

Automatic merge from submit-queue (batch tested with PRs 57366, 57779). 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>.

Remove unused command waitfordetach from flex volume driver

**What this PR does / why we need it**:
Clean unused code.

**Special notes for your reviewer**:
See #35629
Original PR is https://github.com/kubernetes/kubernetes/pull/50754 , the PR's repo has bean deleted，so I create a new PR and merge upstream for test.
**Release note**:

```release-note
NONE
```

pkg/volume/flexvolume/detacher.go

@@ -19,7 +19,6 @@ package flexvolume
 import (
 	"fmt"
 	"os"
-	"time"
 
 	"github.com/golang/glog"
 	"k8s.io/apimachinery/pkg/types"
@@ -47,18 +46,6 @@ func (d *flexVolumeDetacher) Detach(volumeName string, hostName types.NodeName)
 	return err
 }
 
-// WaitForDetach is part of the volume.Detacher interface.
-func (d *flexVolumeDetacher) WaitForDetach(devicePath string, timeout time.Duration) error {
-	call := d.plugin.NewDriverCallWithTimeout(waitForDetachCmd, timeout)
-	call.Append(devicePath)
-
-	_, err := call.Run()
-	if isCmdNotSupportedErr(err) {
-		return (*detacherDefaults)(d).WaitForDetach(devicePath, timeout)
-	}
-	return err
-}
-
 // UnmountDevice is part of the volume.Detacher interface.
 func (d *flexVolumeDetacher) UnmountDevice(deviceMountPath string) error {
 

pkg/volume/flexvolume/driver-call.go

@@ -39,7 +39,6 @@ const (
 	mountDeviceCmd   = "mountdevice"
 
 	detachCmd        = "detach"
-	waitForDetachCmd = "waitfordetach"
 	unmountDeviceCmd = "unmountdevice"
 
 	mountCmd   = "mount"