Allow to configure service network policy

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: I288ad9ad82d4820d70cccd26b73d3c1a44862f9e

charts/maas/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" "maas" -}}
+{{ $netpol_opts | include "helm-toolkit.manifests.kubernetes_network_policy" }}
+{{- end -}}

charts/maas/values.yaml

@@ -75,6 +75,13 @@ dependencies:
         - service: maas_ingress
           endpoint: monitor
 
+network_policy:
+  maas:
+    ingress:
+      - {}
+    egress:
+      - {}
+
 manifests:
   region_statefulset: true
   rack_statefulset: true
@@ -85,6 +92,7 @@ manifests:
   ingress_region: true
   configmap_ingress: true
   maas_ingress: true
+  network_policy: false
 
 images:
   tags: