add restore item action to update PVC selected-node annotation (#2377)

* New RestoreItemAction for PVC with annotation `volume.kubernetes.io/selected-node`

Signed-off-by: mayank <mayank.patel@mayadata.io>

pkg/builder/node_builder.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2020 the Velero contributors.
+
+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 builder
+
+import (
+	corev1api "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// NodeBuilder builds Node objects.
+type NodeBuilder struct {
+	object *corev1api.Node
+}
+
+// ForNode is the constructor for a NodeBuilder.
+func ForNode(name string) *NodeBuilder {
+	return &NodeBuilder{
+		object: &corev1api.Node{
+			TypeMeta: metav1.TypeMeta{
+				APIVersion: corev1api.SchemeGroupVersion.String(),
+				Kind:       "Node",
+			},
+			ObjectMeta: metav1.ObjectMeta{
+				Name: name,
+			},
+		},
+	}
+}
+
+// Result returns the built Node.
+func (b *NodeBuilder) Result() *corev1api.Node {
+	return b.object
+}