Moved VC master designation to membership model

netbox/dcim/signals.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+
+from django.db.models.signals import post_delete
+from django.dispatch import receiver
+
+from .models import VCMembership
+
+
+@receiver(post_delete, sender=VCMembership)
+def delete_empty_vc(instance, **kwargs):
+    """
+    When the last VCMembership of a VirtualChassis has been deleted, delete the VirtualChassis as well.
+    """
+    virtual_chassis = instance.virtual_chassis
+    if not VCMembership.objects.filter(virtual_chassis=virtual_chassis).exists():
+        virtual_chassis.delete()