Replacing the bare pod with a replication controller

This will keep the mariadb pod scheduled.  Downside: you can't count
on there being a pod named `mariadb` anymore.  Upside: Kubernetes
handles supervision fastidiously.

Change-Id: I6bbc67bf3e049ddf6afba195e8803a176c21e4d4
partially-implements: blueprint replication-controllers

services/mariadb/mariadb-pod.yml.j2

@@ -1,33 +1,41 @@
 apiVersion: v1
-kind: Pod
+kind: ReplicationController
 spec:
-  hostNetwork: True
-  containers:
-    - image: "{{ mariadb_image_full }}"
-      name: mariadb
-      volumeMounts:
-        - mountPath: {{ container_config_directory }}
-          name: mariadb-config
-        - mountPath: /var/lib/mysql
-          name: mariadb-persistent-storage
-        - mountPath: /var/log/kolla/
-          name: kolla-logs
-      env:
-        - name: KOLLA_CONFIG_STRATEGY
-          value: {{ config_strategy }}
-        #TODO: Replace with templated values
-        - name: ETCD_HOST
-          value: {{ etcd_ip_address }}
-        - name: ETCD_PORT
-          value: "{{ etcd_port }}"
-  volumes:
-    - name: mariadb-config
-      configMap:
-        name: mariadb-configmap
-    - name: mariadb-persistent-storage
-      hostPath:
-        path: /var/lib/mysql
-    - name: kolla-logs
-      emptyDir: {}
+  replicas: 1
+  selector:
+      service: mariadb
+  template:
+    metadata:
+      labels:
+        service: mariadb
+    spec:
+      hostNetwork: True
+      containers:
+        - image: "{{ mariadb_image_full }}"
+          name: mariadb
+          volumeMounts:
+            - mountPath: {{ container_config_directory }}
+              name: mariadb-config
+            - mountPath: /var/lib/mysql
+              name: mariadb-persistent-storage
+            - mountPath: /var/log/kolla/
+              name: kolla-logs
+          env:
+            - name: KOLLA_CONFIG_STRATEGY
+              value: {{ config_strategy }}
+            #TODO: Replace with templated values
+            - name: ETCD_HOST
+              value: {{ etcd_ip_address }}
+            - name: ETCD_PORT
+              value: "{{ etcd_port }}"
+      volumes:
+        - name: mariadb-config
+          configMap:
+            name: mariadb-configmap
+        - name: mariadb-persistent-storage
+          hostPath:
+            path: /var/lib/mysql
+        - name: kolla-logs
+          emptyDir: {}
 metadata:
    name: mariadb