Refactor secret / local settings handling

uncloud_django_based/uncloud/uncloud_net/models.py

@@ -173,9 +173,6 @@ class VPNNetwork(Product):
 
     wireguard_public_key = models.CharField(max_length=48)
 
-    def save(self, *args, **kwargs):
-        super().save(*args, **kwargs)
-
     def delete(self, *args, **kwargs):
         self.network.status = 'free'
         self.network.save()