Added OAUTH2_ACCESS_TOKEN_URL setting to discovery service

ECOM-3895

playbooks/roles/discovery/defaults/main.yml

@@ -56,6 +56,7 @@ DISCOVERY_VERSION: "master"
 DISCOVERY_DJANGO_SETTINGS_MODULE: "course_discovery.settings.production"
 DISCOVERY_URL_ROOT: 'http://discovery:18381'
 DISCOVERY_OAUTH_URL_ROOT: '{{ EDXAPP_LMS_ISSUER | default("http://127.0.0.1:8000/oauth2") }}'
+DISCOVERY_OAUTH2_ACCESS_TOKEN_URL: '{{ DISCOVERY_OAUTH_URL_ROOT }}/access_token'
 
 DISCOVERY_SECRET_KEY: 'Your secret key here'
 DISCOVERY_TIME_ZONE: 'UTC'
@@ -82,6 +83,8 @@ DISCOVERY_SERVICE_CONFIG:
   SOCIAL_AUTH_EDX_OIDC_URL_ROOT: '{{ DISCOVERY_OAUTH_URL_ROOT }}'
   SOCIAL_AUTH_REDIRECT_IS_HTTPS: '{{ DISCOVERY_SOCIAL_AUTH_REDIRECT_IS_HTTPS }}'
 
+  OAUTH2_ACCESS_TOKEN_URL: '{{ DISCOVERY_OAUTH2_ACCESS_TOKEN_URL }}'
+
   STATIC_ROOT: "{{ COMMON_DATA_DIR }}/{{ discovery_service_name }}/staticfiles"
   # db config
   DATABASE_OPTIONS: