Add example about node label management

Show how to add/remove/change node labels.

Signed-off-by: Flavio Castelli <fcastelli@suse.com>

examples/add-node-label.py

@@ -0,0 +1,36 @@
+# 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.
+
+from pprint import pprint
+from kubernetes import client, config
+
+config.load_kube_config()
+
+api_instance = client.CoreV1Api()
+
+body = {
+    "metadata": {
+        "labels": {
+            "foo": "bar",
+            "baz": None}
+        }
+}
+
+# Change labels of the "minikube" node:
+# - Add label "foo" with value "bar". This will overwrite the "foo" label if it
+#   already exists.
+# - Remove the label "baz" from the node.
+api_response = api_instance.patch_node("minikube", body)
+
+pprint(api_response)