Adding new tender setting for

https://github.com/edx/edx-platform/pull/6576

playbooks/roles/edxapp/defaults/main.yml

@@ -124,6 +124,7 @@ EDXAPP_MODULESTORE_MAPPINGS:
 EDXAPP_GIT_REPO_DIR: '/edx/var/edxapp/course_repos'
 
 EDXAPP_TENDER_DOMAIN: "None"
+EDXAPP_TENDER_SUBODOMAIN: "None"
 
 #Only address should have newlines
 EDXAPP_PDF_RECEIPT_BILLING_ADDRESS: |
@@ -655,6 +656,7 @@ generic_env_config:  &edxapp_generic_env
   EMAIL_USE_TLS: $EDXAPP_EMAIL_USE_TLS
   FEATURES: "{{ EDXAPP_FEATURES }}"
   TENDER_DOMAIN: "{{ EDXAPP_TENDER_DOMAIN }}"
+  TENDER_SUBDOMAIN: "{{ EDXAPP_TENDER_SUBDOMAIN }}"  
   WIKI_ENABLED: true
   SYSLOG_SERVER:  "{{ EDXAPP_SYSLOG_SERVER }}"
   LOG_DIR:  "{{ COMMON_DATA_DIR }}/logs/edx"