Replace django-celery with base Celery (#791)

Update celery tasks to new style & remove djcelery
Vanilla celery + django-celery-beat take over the role of djcelery. Task schedules are consolidated into settings instead of residing in code.
Update docs and example supervisor configs.

docs/installation/auth/quickstart.md

@@ -10,5 +10,5 @@ The big goal of AllianceAuth is the automation of group membership, so we’ll n
 
 To start the background processes to sync groups and check api keys, issue these commands:
 
-    screen -dm bash -c 'python manage.py celeryd'
-    screen -dm bash -c 'python manage.py celerybeat'
+    screen -dm bash -c 'celery -A alliance_auth worker'
+    screen -dm bash -c 'celery -A alliance_auth beat'

docs/installation/auth/supervisor.md

@@ -20,7 +20,7 @@ CentOS:
 
 ## Configuration
 
-Auth provides example config files for the celery workers (celeryd), the periodic task scheduler (celerybeat), and the mumble authenticator. All of these are available in `thirdparty/Supervisor`.
+Auth provides example config files for the celery workers, the periodic task scheduler (celery beat), and the mumble authenticator. All of these are available in `thirdparty/Supervisor`.
 
 For most users, all you have to do is copy the config files to `/etc/supervisor/conf.d` then restart the service. Copy `auth-celerybeat.conf` and `auth-celeryd.conf` for the celery workers, and `auth-mumble.conf` for the mumble authenticator. For all three just use a wildcard:
 
@@ -41,15 +41,15 @@ To ensure the processes are working, check their status:
     sudo supervisorctl status
 
 Processes will be `STARTING`, `RUNNING`, or `ERROR`. If an error has occurred, check their log files:
- - celeryd: `log/worker.log`
- - celerybeat: `log/beat.log`
+ - celery workers: `log/worker.log`
+ - celery beat: `log/beat.log`
  - authenticator: `log/authenticator.log`
 
 ## Customizing Config Files
 
 The only real customization needed is if running in a virtual environment. The python path will have to be changed in order to start in the venv.
 
-Edit the config files and find the line saying `command`. Replace `python` with `/path/to/venv/python`. This can be relative to the `directory` specified in the config file.
+Edit the config files and find the line saying `command`. Replace `python` with `/path/to/venv/bin/python`. For Celery replace `celery` with `/path/to/venv/bin/celery`. This can be relative to the `directory` specified in the config file.
 
 Note that for config changes to be loaded, the supervisor service must be restarted.
 

docs/installation/services/teamspeak3.md

@@ -84,7 +84,7 @@ To enable advanced permissions, on your client go to the `Tools` menu, `Applicat
 ### TS group models not populating on admin site
 The method which populates these runs every 30 minutes. To populate manually, start a celery shell:
 
-    python manage.py celery shell
+    celery -A alliance_auth shell
 
 And execute the update:
 

docs/maintenance/troubleshooting.md

@@ -19,7 +19,7 @@ Either you need to `sudo` that command, or it's a missing dependency. Check [the
 
 ### I'm getting an error 500 trying to connect to the website on a new install
 
-Read the apache error log: `sudo nano /var/log/apache2/error.log`
+Read the apache error log: `sudo less /var/log/apache2/error.log`. Press Shift+G to go to the end of the file.
 
 If it talks about failing to import something, google its name and install it.
 
@@ -36,13 +36,9 @@ Make sure the background processes are running: `ps aux | grep celery` should re
 If that doesn't do it, try clearing the worker queue. First kill all celery processes as described above, then do the following:
 
     redis-cli FLUSHALL
-    python manage.py celeryd --purge
+    celery -A alliance_auth worker --purge
 
-Press control+C once.
-
-    python manage.py celeryd --discard
-
-Press control+C once.
+Press Control+C once.
 
 Now start celery again with [these background process commands.](../installation/auth/quickstart.md)