Merge pull request #1886 from edx/feanil/correct_log_var_truthiness

Use Old style references for booleans.

playbooks/roles/edxapp/defaults/main.yml

@@ -698,7 +698,7 @@ generic_env_config:  &edxapp_generic_env
   DEFAULT_FEEDBACK_EMAIL: "{{ EDXAPP_DEFAULT_FEEDBACK_EMAIL }}"
   SERVER_EMAIL: "{{ EDXAPP_DEFAULT_SERVER_EMAIL }}"
   BULK_EMAIL_DEFAULT_FROM_EMAIL: "{{ EDXAPP_BULK_EMAIL_DEFAULT_FROM_EMAIL }}"
-  BULK_EMAIL_LOG_SENT_EMAILS: "{{ EDXAPP_BULK_EMAIL_LOG_SENT_EMAILS }}"
+  BULK_EMAIL_LOG_SENT_EMAILS: $EDXAPP_BULK_EMAIL_LOG_SENT_EMAILS
   CAS_SERVER_URL: "{{ EDXAPP_CAS_SERVER_URL }}"
   CAS_EXTRA_LOGIN_PARAMS: "{{ EDXAPP_CAS_EXTRA_LOGIN_PARAMS }}"
   CAS_ATTRIBUTE_CALLBACK: "{{ EDXAPP_CAS_ATTRIBUTE_CALLBACK }}"