Add method to instance template model to get template instances of a user

circle/vm/models/instance.py

@@ -200,6 +200,9 @@ class InstanceTemplate(AclBase, VirtualMachineDescModel, TimeStampedModel):
     def get_running_instances(self):
         return Instance.active.filter(template=self, status="RUNNING")
 
+    def get_user_instances(self, user):
+        return Instance.active.filter(template=self, owner=user)
+
     @property
     def metric_prefix(self):
         return 'template.%d' % self.pk