Remove rktnetes code

rktnetes is scheduled to be deprecated in 1.10 (#53601). According to
the deprecation policy for beta CLI and flags, we can remove the feature
in 1.11.

Fixes #58721

cmd/kubelet/app/options/container_runtime.go

@@ -29,8 +29,6 @@ const (
 	// When these values are updated, also update test/e2e/framework/util.go
 	defaultPodSandboxImageName    = "k8s.gcr.io/pause"
 	defaultPodSandboxImageVersion = "3.1"
-	// From pkg/kubelet/rkt/rkt.go to avoid circular import
-	defaultRktAPIServiceEndpoint = "localhost:15441"
 )
 
 var (
@@ -54,7 +52,6 @@ func NewContainerRuntimeOptions() *config.ContainerRuntimeOptions {
 		DockerDisableSharedPID:    true,
 		PodSandboxImage:           defaultPodSandboxImage,
 		ImagePullProgressDeadline: metav1.Duration{Duration: 1 * time.Minute},
-		RktAPIEndpoint:            defaultRktAPIServiceEndpoint,
 		ExperimentalDockershim:    false,
 	}
 }