Fix DoesNotExist error on android credentials creation

In some environments, the login_service_user may not be available. Thus,
we create a dedicated android user for the mobile app.

See
https://discuss.overhang.io/t/upgrading-to-juniper-fails-with-user-matching-query-does-not-exist/678

tutor/templates/hooks/lms/init

@@ -5,12 +5,13 @@ echo "Loading settings $DJANGO_SETTINGS_MODULE"
 ./manage.py lms migrate
 
 # Create oauth credentials for Android application
+./manage.py lms manage_user android android@openedx --staff --superuser
 ./manage.py lms create_dot_application \
     --client-id android \
     --client-secret {{ ANDROID_OAUTH2_SECRET }} \
     --grant-type password \
     android \
-    login_service_user
+    android
 
 # Fix incorrect uploaded file path
 if [ -d /openedx/data/uploads/ ]; then