[retrace] Fix syntax errors in rabbitmq section

This fixes the syntax errors in the rabbitmq section by following syntax
in greenwave.yml file. However I do not know if the correct hosts are
having this run on it. All other hosts set up the queues locally versus
on rabbitmq boxes.

Signed-off-by: Stephen Smoogen <smooge@redhat.com>

playbooks/groups/retrace.yml

@@ -6,10 +6,11 @@
 
   vars_files:
     - /srv/web/infra/ansible/vars/global.yml
-    - "{{private}}/vars.yml"
+    - "/srv/private/ansible/vars.yml"
     - /srv/web/infra/ansible/vars/{{ ansible_distribution }}.yml
 
-  roles: rabbit/queue
+  roles: 
+  - role: rabbit/queue
     username: "faf"
     queue_name: "faf"
     routing_keys:
@@ -29,8 +30,6 @@
       - "org.fedoraproject.*.faf.problem.threshold10000"
       - "org.fedoraproject.*.faf.problem.threshold100000"
       - "org.fedoraproject.*.faf.problem.threshold1000000"
-   tags:
-    - rabbitmq
 
 - name: Setup retrace hosts
   hosts: retrace:retrace-stg