Previously, this was hammered on in aws.py for all DBs

Instead, turn it on for the databases where it makes sense.

playbooks/roles/edxapp/defaults/main.yml

@@ -679,6 +679,7 @@ edxapp_generic_auth_config:  &edxapp_generic_auth
       PASSWORD: "{{ EDXAPP_MYSQL_PASSWORD }}"
       HOST: "{{ EDXAPP_MYSQL_HOST }}"
       PORT: "{{ EDXAPP_MYSQL_PORT }}"
+      ATOMIC_REQUESTS: True
   ANALYTICS_API_KEY:  "{{ EDXAPP_ANALYTICS_API_KEY }}"
   EMAIL_HOST_USER: "{{ EDXAPP_EMAIL_HOST_USER }}"
   EMAIL_HOST_PASSWORD: "{{ EDXAPP_EMAIL_HOST_PASSWORD }}"