VOL-1366: Prevent numerous reflows to BAL

Change-Id: I3bf5d9504688d69c05e03a366a5ad70d4c8b3c64
diff --git a/voltha/adapters/openolt/openolt_device.py b/voltha/adapters/openolt/openolt_device.py
index 9b55091..00e5b4b 100644
--- a/voltha/adapters/openolt/openolt_device.py
+++ b/voltha/adapters/openolt/openolt_device.py
@@ -121,6 +121,7 @@
             device.oper_status = OperStatus.ACTIVATING
             self.adapter_agent.update_device(device)
 
+        self.logical_device_id = None
         # If logical device does exist use it, else create one after connecting to device
         if device.parent_id:
             # logical device already exists