Correct the syntax for the rabbitmq config file.

playbooks/roles/rabbitmq/templates/etc/rabbitmq/rabbitmq.config.j2

 % {{ ansible_managed }}
 
-[{rabbit,
+[{rabbit, [
   {log_levels, [{connection, info}]},
 {% if RABBITMQ_CLUSTERED -%}
   {%- set hosts= [] -%}
@@ -9,7 +9,7 @@
     {% do hosts.append("rabbit@ip-" + host.replace('.','-')) %}
   {%- endfor %}
 
-  [{cluster_nodes, {['{{ hosts|join("\',\'") }}'], disc}}]
+  {cluster_nodes, {['{{ hosts|join("\',\'") }}'], disc}}
 
 {%- else -%}
 {# If rabbitmq_clustered_hosts is set, use that instead assuming an aws stack.
@@ -17,4 +17,4 @@
 #}
   [{cluster_nodes, {['{{ rabbitmq_clustered_hosts|join("\',\'") }}'], disc}}]
 {%- endif -%}
-}].
+]}].