Merge "Improve rabbitmq-clusterer template code format"

ansible/roles/rabbitmq/templates/rabbitmq-clusterer.config.j2

 [
   {version, 1},
   {nodes, [
-{% for host in groups['rabbitmq'] %}    {'rabbit@{{ hostvars[host]['ansible_hostname'] }}', disc}{% if not loop.last %},{% endif %}
-
-{% endfor %}
+  {% for host in groups['rabbitmq'] %}
+    {'rabbit@{{ hostvars[host]['ansible_hostname'] }}', disc}
+      {%- if not loop.last -%},{%- endif %}
+  {% endfor %}
   ]},
-  {gospel, {node, 'rabbit@{{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}'}}
+  {gospel,
+    {node, 'rabbit@{{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}'}}
 ].