Upgrade k8s.io/client-go to version 2

vendor/k8s.io/client-go/pkg/fields/fields.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2015 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 fields
+
+import (
+	"sort"
+	"strings"
+)
+
+// Fields allows you to present fields independently from their storage.
+type Fields interface {
+	// Has returns whether the provided field exists.
+	Has(field string) (exists bool)
+
+	// Get returns the value for the provided field.
+	Get(field string) (value string)
+}
+
+// Set is a map of field:value. It implements Fields.
+type Set map[string]string
+
+// String returns all fields listed as a human readable string.
+// Conveniently, exactly the format that ParseSelector takes.
+func (ls Set) String() string {
+	selector := make([]string, 0, len(ls))
+	for key, value := range ls {
+		selector = append(selector, key+"="+value)
+	}
+	// Sort for determinism.
+	sort.StringSlice(selector).Sort()
+	return strings.Join(selector, ",")
+}
+
+// Has returns whether the provided field exists in the map.
+func (ls Set) Has(field string) bool {
+	_, exists := ls[field]
+	return exists
+}
+
+// Get returns the value in the map for the provided field.
+func (ls Set) Get(field string) string {
+	return ls[field]
+}
+
+// AsSelector converts fields into a selectors.
+func (ls Set) AsSelector() Selector {
+	return SelectorFromSet(ls)
+}