Changes update strategy from OnDelete to automatic

To see this in action, with no other changes:
kubectl -n kafka patch statefulset kafka --type='json' -p='[{"op": "replace", "path": "/spec/updateStrategy/type", "value": "RollingUpdate"}]'

Author: solsson

kafka/50kafka.yml

@@ -11,7 +11,7 @@ spec:
   serviceName: "broker"
   replicas: 3
   updateStrategy:
-    type: OnDelete
+    type: RollingUpdate
   template:
     metadata:
       labels: