add more ldap tasks

- add custom celery router osusers.tasks.LdapRouter
- add tasks add_ldap_user_to_group, delete_ldap_group_if_empty,
  delete_ldap_user and remove_ldap_user_from_group
- implement osusers.models.Group.save and osusers.models.Group.delete
- implement save, delete and set_password methods in osusers.models.User
- implement save and delete methods in osusers.models.AdditionalGroup

gnuviechadmin/gnuviechadmin/settings/base.py

@@ -284,10 +284,9 @@ BROKER_URL = get_env_variable('GVA_BROKER_URL')
 CELERY_RESULT_BACKEND = 'amqp'
 CELERY_RESULT_PERSISTENT = True
 CELERY_TASK_RESULT_EXPIRES = None
-CELERY_ROUTES = {
-    'osusers.tasks.create_ldap_group': {'queue': 'ldap'},
-    'osusers.tasks.create_ldap_user': {'queue': 'ldap'},
-}
+CELERY_ROUTES = (
+    'osusers.tasks.LdapRouter',
+)
 ########## END CELERY CONFIGURATION