Try overriding rabbitmq_server when creating queues

The default was changed from 01 to 03, and I'm not sure why, and
this playbook fails where it used to succeed. So see if changing
this helps.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

playbooks/groups/openqa.yml

@@ -42,6 +42,9 @@
    - "/srv/private/ansible/vars.yml"
    - /srv/web/infra/ansible/vars/{{ ansible_distribution }}.yml
 
+  vars:
+    rabbitmq_server: "rabbitmq01{{ env_suffix }}.phx2.fedoraproject.org"
+
   roles:
   - role: rabbit/queue
     username: "openqa"