[rabbitmq] Use a safe cluster_formation.node_cleanup.only_log_warning value (#4823)

* [rabbitmq] Use a safe cluster_formation.node_cleanup.only_log_warning value

This chart ended up adopting an unfortunate value used in the example
that ships with the K8S peer discovery plugin [1].

The goal was never to recommend it to all users, as the docs are pretty
clear on that automatic node cleanup can have dangerous side effects when nodes go offline temporarily, e.g.
as in [3].

Kudos to Petr Šebek for pointing this out on rabbitmq-users [4].

1. https://github.com/rabbitmq/rabbitmq-peer-discovery-k8s/blob/b309d641ce7ccf135d02fb39254e8c67c98d3a63/examples/k8s_statefulsets/rabbitmq_statefulsets.yaml#L40
2. http://www.rabbitmq.com/cluster-formation.html#node-health-checks-and-cleanup
3. https://groups.google.com/d/msg/rabbitmq-users/wuOfzEywHXo/vm3n1VsfBgAJ
4. https://groups.google.com/forum/#!msg/rabbitmq-users/wuOfzEywHXo/k8z_HWIkBgAJ

* Correct a comment typo

* [rabbitmq] Bump version to 1.3.2

Apparently this is an accepted practice for this repo and not
doing so will make CI fail.

stable/rabbitmq-ha/Chart.yaml

@@ -1,7 +1,7 @@
 name: rabbitmq-ha
 apiVersion: v1
 appVersion: 3.7.3
-version: 1.3.1
+version: 1.3.2
 description: Highly available RabbitMQ cluster, the open source message broker
   software that implements the Advanced Message Queuing Protocol (AMQP).
 keywords:

stable/rabbitmq-ha/templates/configmap.yaml

@@ -58,7 +58,9 @@ data:
     cluster_formation.k8s.host = kubernetes.default.svc.cluster.local
     cluster_formation.k8s.address_type = hostname
     cluster_formation.node_cleanup.interval = 10
-    cluster_formation.node_cleanup.only_log_warning = false
+    # Set to false if automatic cleanup of absent nodes is desired.
+    # This can be dangerous, see http://www.rabbitmq.com/cluster-formation.html#node-health-checks-and-cleanup.
+    cluster_formation.node_cleanup.only_log_warning = true
     cluster_partition_handling = autoheal
 
     ## The default "guest" user is only permitted to access the server