Revert "fix miss rabbitmq config when hostname include special character"

This change breaks ubuntu

This reverts commit 04992a3d.

Change-Id: I5e38d4c4a37ee90603ad04ab4b9d03298b6b2eb2

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 %}
+{% 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'] }}}}
 ].