Add tenancy to cluster

fix pep8

netbox/virtualization/migrations/0010_cluster_add_tenant.py

@@ -0,0 +1,18 @@
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tenancy', '0001_initial'),
+        ('virtualization', '0009_custom_tag_models'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='cluster',
+            name='tenant',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='clusters', to='tenancy.Tenant'),
+        ),
+    ]