[CORD-3017] Working around ONOS driver issue

Change-Id: I8ac1735927409aaaffe3a7654925261314faa149
diff --git a/xos/synchronizer/models/volt.xproto b/xos/synchronizer/models/volt.xproto
index d7e8b70..16c3955 100644
--- a/xos/synchronizer/models/volt.xproto
+++ b/xos/synchronizer/models/volt.xproto
@@ -29,7 +29,7 @@
     option description="Represents a physical OLT device";
 
     required manytoone volt_service->VOLTService:volt_devices = 1 [db_index = True, null = False, blank = False];
-    required string name = 2 [help_text = "name of device", max_length = 254, null = False, db_index = False, blank = False, unique = True];
+    optional string name = 2 [help_text = "name of device", max_length = 254, null = True, db_index = False, blank = True, unique = True];
     required string device_type = 3 [help_text = "Device Type", default = "asfvolt16_olt", max_length = 254, null = False, db_index = False, blank = False, tosca_key=True];
     required string host = 4 [help_text = "Host", max_length = 254, null = False, db_index = False, blank = False, tosca_key=True];
     required int32 port = 5 [help_text = "Fabric port", null = False, db_index = False, blank = False, tosca_key=True];