Update the commoncluster play to remove repeats.

playbooks/edx-east/commoncluster.yml

@@ -26,21 +26,19 @@
       when: elb_pre_post
   roles:
     - aws
-    - role: nginx
-      nginx_sites:
-      - xqueue
-    - role: xqueue
     - role: datadog
       when: COMMON_ENABLE_DATADOG
     - role: splunkforwarder
       when: COMMON_ENABLE_SPLUNKFORWARDER
     - role: newrelic
       when: COMMON_ENABLE_NEWRELIC
+    - role: nginx
+      nginx_sites:
+      - xqueue
+    - xqueue
     - oraclejdk
     - elasticsearch
     - rabbitmq
-    - datadog
-    - splunkforwarder
   post_tasks:
     - debug: var="{{ ansible_ec2_instance_id }}"
       when: elb_pre_post