asynchronous refactoring

- don't execute celery tasks directly
- introduce optional parameters to fileserver tasks to allow chaining
- handle user/group/key create and delete tasks in new osusers.signals
  class
- adapt unit tests
- change TaskResults model to store the task signatures
- generalize the local settings' logging configuration

gnuviechadmin/fileservertasks/tasks.py

@@ -9,7 +9,7 @@ from celery import shared_task
 
 
 @shared_task
-def setup_file_sftp_userdir(username):
+def setup_file_sftp_userdir(username, *args, **kwargs):
     """
     This task creates the home directory for an SFTP user if it does not exist
     yet.
@@ -23,7 +23,7 @@ def setup_file_sftp_userdir(username):
 
 
 @shared_task
-def delete_file_sftp_userdir(username):
+def delete_file_sftp_userdir(username, *args, **kwargs):
     """
     This task recursively deletes the home directory of an SFTP user if it
     does not exist yet.
@@ -37,7 +37,7 @@ def delete_file_sftp_userdir(username):
 
 
 @shared_task
-def setup_file_mail_userdir(username):
+def setup_file_mail_userdir(username, *args, **kwargs):
     """
     This task creates the mail base directory for a user if it does not exist
     yet.
@@ -52,7 +52,7 @@ def setup_file_mail_userdir(username):
 
 
 @shared_task
-def delete_file_mail_userdir(username):
+def delete_file_mail_userdir(username, *args, **kwargs):
     """
     This task recursively deletes the mail base directory for a user if it
     does not exist yet.