Merge pull request kubernetes#59472 from hanxiaoshuai/fixtodo02072

Automatic merge from submit-queue (batch tested with PRs 59276, 51042, 58973, 59377, 59472). 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>.

clean up unused function GetKubeletDockerContainers

**What this PR does / why we need it**:
fix todo: function GetKubeletDockerContainers is not unused,it has been migrated off in test/e2e_node/garbage_collector_test.go  in [kubernetes#57976](https://github.com/kubernetes/kubernetes/pull/57976/files)
**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 #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/kubelet/dockershim/libdocker/client.go

@@ -17,7 +17,6 @@ limitations under the License.
 package libdocker
 
 import (
-	"strings"
 	"time"
 
 	dockertypes "github.com/docker/docker/api/types"
@@ -37,10 +36,6 @@ const (
 	StatusCreatedPrefix = "Created"
 	StatusExitedPrefix  = "Exited"
 
-	// This is only used by GetKubeletDockerContainers(), and should be removed
-	// along with the function.
-	containerNamePrefix = "k8s"
-
 	// Fake docker endpoint
 	FakeDockerEndpoint = "fake://"
 )
@@ -109,29 +104,3 @@ func ConnectToDockerOrDie(dockerEndpoint string, requestTimeout, imagePullProgre
 	glog.Infof("Start docker client with request timeout=%v", requestTimeout)
 	return newKubeDockerClient(client, requestTimeout, imagePullProgressDeadline)
 }
-
-// GetKubeletDockerContainers lists all container or just the running ones.
-// Returns a list of docker containers that we manage
-// TODO: This function should be deleted after migrating
-// test/e2e_node/garbage_collector_test.go off of it.
-func GetKubeletDockerContainers(client Interface, allContainers bool) ([]*dockertypes.Container, error) {
-	result := []*dockertypes.Container{}
-	containers, err := client.ListContainers(dockertypes.ContainerListOptions{All: allContainers})
-	if err != nil {
-		return nil, err
-	}
-	for i := range containers {
-		container := &containers[i]
-		if len(container.Names) == 0 {
-			continue
-		}
-		// Skip containers that we didn't create to allow users to manually
-		// spin up their own containers if they want.
-		if !strings.HasPrefix(container.Names[0], "/"+containerNamePrefix+"_") {
-			glog.V(5).Infof("Docker Container: %s is not managed by kubelet.", container.Names[0])
-			continue
-		}
-		result = append(result, container)
-	}
-	return result, nil
-}