force usernames to be < 28 characters

panikdb/aa/management/commands/load-csv-users.py

@@ -26,6 +26,8 @@ class Command(BaseCommand):
             else:
                 continue
 
+            username = username[:28]
+
             try:
                 user = User.objects.get(username=username)
             except User.DoesNotExist: