CORD-1913: Restore execution of custom service save() methods in attics

Change-Id: I66f57e6ac6cf4abb350400e27f4ad8572ab15f7d
(cherry picked from commit 4c30cf0b9f91e5d054627b48acfdbbae8611abee)
diff --git a/xos/attic/vtrtenant_model.py b/xos/attic/vtrtenant_model.py
index ca93c6b..b64fc49 100644
--- a/xos/attic/vtrtenant_model.py
+++ b/xos/attic/vtrtenant_model.py
@@ -22,9 +22,6 @@
         self._meta.get_field("owner").default = vtr_services[0].id
     super(VTRTenant, self).__init__(*args, **kwargs)
 
-def save(self, *args, **kwargs):
-    super(VTRTenant, self).save(*args, **kwargs)
-
 def delete(self, *args, **kwargs):
     super(VTRTenant, self).delete(*args, **kwargs)