Fix typo - ANALYTICS_PIPELINE_OUTPUT_DATABASE contains `username` key, not `user`

playbooks/roles/analytics_pipeline/tasks/main.yml

@@ -186,7 +186,7 @@
 
 - name: grant access to table storing test data in output database
   mysql_user: >
-    user={{ ANALYTICS_PIPELINE_OUTPUT_DATABASE.user }}
+    user={{ ANALYTICS_PIPELINE_OUTPUT_DATABASE.username }}
     password={{ ANALYTICS_PIPELINE_OUTPUT_DATABASE.password }}
     priv=acceptance%.*:ALL
     append_privs=yes