remove rktnetes related code

pkg/kubelet/container/helpers.go

@@ -19,7 +19,6 @@ package container
 import (
 	"bytes"
 	"fmt"
-	"hash/adler32"
 	"hash/fnv"
 	"strings"
 	"time"
@@ -100,17 +99,6 @@ func HashContainer(container *v1.Container) uint64 {
 	return uint64(hash.Sum32())
 }
 
-// HashContainerLegacy returns the hash of the container. It is used to compare
-// the running container with its desired spec.
-// This is used by rktnetes and dockershim (for handling <=1.5 containers).
-// TODO: Remove this function when kubernetes version is >=1.8 AND rktnetes
-// update its hash function.
-func HashContainerLegacy(container *v1.Container) uint64 {
-	hash := adler32.New()
-	hashutil.DeepHashObject(hash, *container)
-	return uint64(hash.Sum32())
-}
-
 // EnvVarsToMap constructs a map of environment name to value from a slice
 // of env vars.
 func EnvVarsToMap(envs []EnvVar) map[string]string {