rebase: update kubernetes to v1.20.0

updated kubernetes packages to latest
release.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/utils/strings/strings.go

@@ -1,46 +0,0 @@
-/*
-Copyright 2014 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package strings
-
-import (
-	"path"
-	"strings"
-)
-
-// SplitQualifiedName Splits a fully qualified name and returns its namespace and name.
-// Assumes that the input 'str' has been validated.
-func SplitQualifiedName(str string) (string, string) {
-	parts := strings.Split(str, "/")
-	if len(parts) < 2 {
-		return "", str
-	}
-	return parts[0], parts[1]
-}
-
-// JoinQualifiedName joins 'namespace' and 'name' and returns a fully qualified name
-// Assumes that the input is valid.
-func JoinQualifiedName(namespace, name string) string {
-	return path.Join(namespace, name)
-}
-
-// ShortenString returns the first N slice of a string.
-func ShortenString(str string, n int) string {
-	if len(str) <= n {
-		return str
-	}
-	return str[:n]
-}