Upgrade k8s.io/client-go to version 2

vendor/k8s.io/client-go/pkg/apis/extensions/helpers.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2016 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 extensions
+
+import (
+	"strings"
+)
+
+// SysctlsFromPodSecurityPolicyAnnotation parses an annotation value of the key
+// SysctlsSecurityPolocyAnnotationKey into a slice of sysctls. An empty slice
+// is returned if annotation is the empty string.
+func SysctlsFromPodSecurityPolicyAnnotation(annotation string) ([]string, error) {
+	if len(annotation) == 0 {
+		return []string{}, nil
+	}
+
+	return strings.Split(annotation, ","), nil
+}
+
+// PodAnnotationsFromSysctls creates an annotation value for a slice of Sysctls.
+func PodAnnotationsFromSysctls(sysctls []string) string {
+	return strings.Join(sysctls, ",")
+}