Sets OnDelete explicitly, as RollingUpdate is a new default

Due to the use of config map for most of the conifg,
RollingUpdate will be surprising, while still not preventing
running pods that don't have the applied configuration.

An automation effort would be required for proper RollingUpdate behavior.

Author: solsson

kafka/50kafka.yml

@@ -10,6 +10,8 @@ spec:
       app: kafka
   serviceName: "broker"
   replicas: 3
+  updateStrategy:
+    type: OnDelete
   template:
     metadata:
       labels:

zookeeper/50pzoo.yml

@@ -11,6 +11,8 @@ spec:
       storage: persistent
   serviceName: "pzoo"
   replicas: 3
+  updateStrategy:
+    type: OnDelete
   template:
     metadata:
       labels:

zookeeper/51zoo.yml

@@ -10,6 +10,8 @@ spec:
       storage: ephemeral
   serviceName: "zoo"
   replicas: 2
+  updateStrategy:
+    type: OnDelete
   template:
     metadata:
       labels: