adding default celery user for workers

playbooks/roles/edxapp/defaults/main.yml

@@ -54,7 +54,7 @@ EDXAPP_ANALYTICS_API_KEY:  ''
 EDXAPP_ZENDESK_USER: ''
 EDXAPP_ZENDESK_API_KEY: ''
 EDXAPP_CELERY_USER: 'celery'
-EDXAPP_CELERY_PASSWORD: ''
+EDXAPP_CELERY_PASSWORD: 'celery'
 
 EDXAPP_MITX_FEATURES:
   AUTH_USE_OPENID_PROVIDER: true

playbooks/roles/rabbitmq/defaults/main.yml

@@ -23,6 +23,8 @@ RABBIT_USERS:
     password: 'the example admin password'
   - name: 'edx'
     password: 'edx'
+  - name: 'celery'
+    password: 'celery'
 
 # Structure for auth config file.
 rabbitmq_auth_config: