Clean up dockershim flags in the kubelet

Signed-off-by: cyclinder <qifeng.guo@daocloud.io>
Co-authored-by: Ciprian Hacman <ciprian@hakman.dev>
Signed-off-by: Ciprian Hacman <ciprian@hakman.dev>

pkg/kubelet/cadvisor/cadvisor_linux_test.go

@@ -37,12 +37,6 @@ func TestImageFsInfoLabel(t *testing.T) {
 		expectedLabel   string
 		expectedError   error
 	}{{
-		description:     "LabelDockerImages should be returned",
-		runtime:         types.DockerContainerRuntime,
-		runtimeEndpoint: "",
-		expectedLabel:   cadvisorfs.LabelDockerImages,
-		expectedError:   nil,
-	}, {
 		description:     "LabelCrioImages should be returned",
 		runtime:         types.RemoteContainerRuntime,
 		runtimeEndpoint: CrioSocket,