Soft pod anti-affinity for all pods

This PS adds soft anti-affinity to all pods in OS-H. By doing so
resiliancy is improved by attempting to ensure that pods are created
on seperate nodes.

Change-Id: I0c1092498f7a1e44218ef785ca3f73fa9f49819c

helm-toolkit/templates/snippets/_k8s_metadata_labels.tpl

@@ -0,0 +1,22 @@
+# Copyright 2017 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.
+
+{{- define "helm-toolkit.snippets.kubernetes_metadata_labels" -}}
+{{- $envAll := index . 0 -}}
+{{- $application := index . 1 -}}
+{{- $component := index . 2 -}}
+release_name: {{ $envAll.Release.Name }}
+application: {{ $application }}
+component: {{ $component }}
+{{- end -}}

helm-toolkit/templates/snippets/_k8s_pod_antiaffinity.tpl

@@ -0,0 +1,38 @@
+# Copyright 2017 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.
+
+{{- define "helm-toolkit.snippets.kubernetes_pod_anti_affinity" -}}
+{{- $envAll := index . 0 -}}
+{{- $application := index . 1 -}}
+{{- $component := index . 2 -}}
+podAntiAffinity:
+  preferredDuringSchedulingIgnoredDuringExecution:
+  - podAffinityTerm:
+      labelSelector:
+        matchExpressions:
+        - key: release_name
+          operator: In
+          values:
+            - {{ $envAll.Release.Name }}
+        - key: application
+          operator: In
+          values:
+            - {{ $application }}
+        - key: component
+          operator: In
+          values:
+            - {{ $component }}
+      topologyKey: kubernetes.io/hostname
+    weight: 10
+{{- end -}}