Remove unused code

pkg/kubelet/container/helpers.go

@@ -259,10 +259,6 @@ type containerCommandRunnerWrapper struct {
 
 var _ ContainerCommandRunner = &containerCommandRunnerWrapper{}
 
-func DirectStreamingRunner(runtime DirectStreamingRuntime) ContainerCommandRunner {
-	return &containerCommandRunnerWrapper{runtime}
-}
-
 func (r *containerCommandRunnerWrapper) RunInContainer(id ContainerID, cmd []string, timeout time.Duration) ([]byte, error) {
 	var buffer bytes.Buffer
 	output := ioutils.WriteCloserWrapper(&buffer)
@@ -300,21 +296,6 @@ func HasPrivilegedContainer(pod *v1.Pod) bool {
 	return false
 }
 
-// MakeCapabilities creates string slices from Capability slices
-func MakeCapabilities(capAdd []v1.Capability, capDrop []v1.Capability) ([]string, []string) {
-	var (
-		addCaps  []string
-		dropCaps []string
-	)
-	for _, cap := range capAdd {
-		addCaps = append(addCaps, string(cap))
-	}
-	for _, cap := range capDrop {
-		dropCaps = append(dropCaps, string(cap))
-	}
-	return addCaps, dropCaps
-}
-
 // MakePortMappings creates internal port mapping from api port mapping.
 func MakePortMappings(container *v1.Container) (ports []PortMapping) {
 	names := make(map[string]struct{})