convert Organization to django migration

awx/main/migrations/_rbac.py

@@ -0,0 +1,17 @@
+from collections import defaultdict
+
+def migrate_organization(apps, schema_editor):
+    migrations = defaultdict(list)
+    organization = apps.get_model('main', "Organization")
+    for org in organization.objects.all():
+        for admin in org.admins.all():
+            org.admin_role.members.add(admin)
+            migrations[org.name].append(admin)
+        for user in org.users.all():
+            org.auditor_role.members.add(user)
+            migrations[org.name].append(user)
+    return migrations
+
+
+def unmigrate_organization(apps, schema_editor):
+    pass