change Club.unix_name to Club.slug_name and remove it from forms

club/migrations/0011_auto_20180426_2013.py

@@ -1,10 +1,9 @@
 from __future__ import unicode_literals
 
 import django.db.models.deletion
+from django.conf import settings
 from django.db import migrations, models
 
-import club.models
-
 
 class Migration(migrations.Migration):
     dependencies = [("club", "0010_auto_20170912_2028")]
@@ -15,7 +14,7 @@ class Migration(migrations.Migration):
             name="owner_group",
             field=models.ForeignKey(
                 on_delete=django.db.models.deletion.CASCADE,
-                default=club.models.get_default_owner_group,
+                default=lambda: settings.SITH_ROOT_USER_ID,
                 related_name="owned_club",
                 to="core.Group",
             ),