add automated user role for rabbit

playbooks/edx-east/rabbitmq.yml

@@ -31,6 +31,8 @@
       when: elb_pre_post
   roles:
     - aws
+    - role: automated
+      AUTOMATED_USERS: "{{ RABBIT_AUTOMATED_USERS | default({}) }}"
     - rabbitmq
     - role: splunkforwarder
       when: COMMON_ENABLE_SPLUNKFORWARDER