added AGGREGATION_EXCLUDE_ROLES roles setting

updated changelog

CHANGELOG.md

@@ -257,6 +257,7 @@
   - Added `EDXAPP_SETTINGS` to allow using a settings file other than `aws.py`. Default: `aws`
   - Renamed `ENABLE_S3_GRADE_DOWNLOADS` to `ENABLE_GRADE_DOWNLOADS`
   - Replaced `EDXAPP_GRADE_STORAGE_TYPE`, `EDXAPP_GRADE_BUCKET` and `EDXAPP_GRADE_ROOT_PATH` with `EDXAPP_GRADE_STORAGE_CLASS` and `EDXAPP_GRADE_STORAGE_KWARGS`
+  - Added `EDXAPP_AGGREGATION_EXCLUDE_ROLES`
 - Role: openstack
   - Added role
 - Role: vhost

playbooks/roles/edxapp/defaults/main.yml

@@ -518,6 +518,7 @@ EDXAPP_VIDEO_UPLOAD_PIPELINE:
   ROOT_PATH: ''
 
 EDXAPP_CORS_ORIGIN_WHITELIST: []
+EDXAPP_AGGREGATION_EXCLUDE_ROLES: []
 EDXAPP_CORS_ORIGIN_ALLOW_ALL: false
 EDXAPP_CROSS_DOMAIN_CSRF_COOKIE_DOMAIN: ""
 EDXAPP_CROSS_DOMAIN_CSRF_COOKIE_NAME: ""
@@ -848,6 +849,7 @@ generic_env_config:  &edxapp_generic_env
   FINANCIAL_REPORTS: "{{ EDXAPP_FINANCIAL_REPORTS }}"
   ONLOAD_BEACON_SAMPLE_RATE: "{{ EDXAPP_ONLOAD_BEACON_SAMPLE_RATE }}"
   CORS_ORIGIN_WHITELIST: "{{ EDXAPP_CORS_ORIGIN_WHITELIST }}"
+  AGGREGATION_EXCLUDE_ROLES: "{{ EDXAPP_AGGREGATION_EXCLUDE_ROLES }}"
   CORS_ORIGIN_ALLOW_ALL: "{{ EDXAPP_CORS_ORIGIN_ALLOW_ALL }}"
   CROSS_DOMAIN_CSRF_COOKIE_DOMAIN: "{{ EDXAPP_CROSS_DOMAIN_CSRF_COOKIE_DOMAIN }}"
   CROSS_DOMAIN_CSRF_COOKIE_NAME: "{{ EDXAPP_CROSS_DOMAIN_CSRF_COOKIE_NAME }}"