simplyfy celery queue deployment

etc/init/pandora-tasks.conf

@@ -8,7 +8,12 @@ stop on runlevel [!2345]
 
 respawn
 
-chdir /srv/pandora/pandora
-
-exec /bin/su pandora -s /usr/bin/python2.6 /srv/pandora/pandora/bin/pandora-tasks
+env VENV=/srv/pandora
+env USER=pandora
 
+script
+test -e /var/log/pandora || (mkdir -p /var/log/pandora && chown $USER:$USER /var/log/pandora)
+cd $VENV/pandora
+exec /usr/bin/sudo -u pandora $VENV/bin/python $VENV/pandora/manage.py celeryd \
+                   -Q tasks -f /var/log/pandora/pandora-tasks.log -l INFO
+end script