add node type option to rabbitmq clustering

Currently, rabbitmq clustering is using the autocluster plugin,
and NODE_TYPE is set to disc in default. so every nodes join cluster as disc node.
However, since there is a need for disc + ram clustering for the performance.
if change node_type from disc to ram, clustering configured as [disc + ram + ram].

Change-Id: Ie83689b0554f0f993bdffac666f0f56db8082992

rabbitmq/templates/etc/_rabbitmq-env.conf.tpl

@@ -19,3 +19,4 @@ AUTOCLUSTER_DELAY={{ .Values.autocluster.delay }}
 RABBITMQ_USE_LONGNAME=true
 AUTOCLUSTER_LOG_LEVEL={{ .Values.autocluster.log_level }}
 NODENAME="rabbit@${RABBITMQ_POD_IP}"
+RABBITMQ_NODE_TYPE={{ .Values.autocluster.node_type }}

rabbitmq/templates/etc/_rabbitmq.config.tpl

@@ -36,6 +36,7 @@
      ,{etcd_scheme, http}
      ,{etcd_host, {{ .Values.endpoints.etcd.hosts.default }}}
      ,{etcd_port, {{ .Values.endpoints.etcd.port }}}
+     ,{node_type, {{ .Values.autocluster.node_type }} }
    ]}
 ].
 % EOF

rabbitmq/values.yaml

@@ -69,6 +69,7 @@ endpoints:
 autocluster:
   log_level: info
   delay: 15
+  node_type: disc
 
 probes_delay: 180
 probes_timeout: 10