Allow to configure service network policy for apiserver-webhook

The patch introduces network policy configuration similar
to openstack-helm services. It allows users to configure
policies depending on the environment.

* Network policies are disabled by default.
* When enabled default policies allow all ingress and
  egress traffic (i.e. policy set to {}), this may be
  changed in future patch-sets.

Change-Id: I3c6457f4abc9accf39cd9320208899200a43f828

charts/apiserver-webhook/templates/network_policy.yaml

@@ -0,0 +1,18 @@
+# Copyright 2017-2018 The Openstack-Helm 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.
+
+{{- if .Values.manifests.network_policy -}}
+{{- $netpol_opts := dict "envAll" . "name" "application" "label" "kubernetes-keystone-webhook" -}}
+{{ $netpol_opts | include "helm-toolkit.manifests.kubernetes_network_policy" }}
+{{- end -}}

charts/apiserver-webhook/values.yaml

@@ -194,6 +194,13 @@ endpoints:
       client:
         default: 2379
 
+network_policy:
+  kubernetes-keystone-webhook:
+    ingress:
+      - {}
+    egress:
+      - {}
+
 pod:
   mounts:
     kubernetes_apiserver:
@@ -384,3 +391,4 @@ manifests:
   secret_keystone: true
   secret_tls: true
   service: true
+  network_policy: false