Cleanup VMProduct serializer, add name field to VMProduct

uncloud/uncloud_vm/models.py

@@ -41,6 +41,10 @@ class VMProduct(Product):
                                  null=True)
 
     description = "Virtual Machine"
+
+    # VM-specific. The name is only intended for customers: it's a pain te
+    # remember IDs (speaking from experience as ungleich customer)!
+    name = models.CharField(max_length=32)
     cores = models.IntegerField()
     ram_in_gb = models.FloatField()