When a device is configured to to connect to a controller before the controller is started, the device may not show up in inventory

This happens because the openflowplugin connects to the device and issues nodeUpdated notification before the InventoryManager is even started. Thus the inventory manager misses those notifications and does not add the node to inventory.

This has been observed with Helium code and may no longer happen with the rewrite in Lithium. We should however add a test where we have the device pointed to the controller before it is started to ensure that this does not happen anymore.