remove BD-BD damping timer

src/main/java/net/floodlightcontroller/devicemanager/internal/DeviceManagerImpl.java

@@ -645,7 +645,7 @@ public class DeviceManagerImpl implements IDeviceManagerService, IOFMessageListe
     protected static int DEVICE_NA_MAX_AGE = 60 * 60 *  2;
     protected static int DEVICE_AP_MAX_AGE = 60 * 60 *  2;
     protected static long NBD_TO_BD_TIMEDIFF_MS = 300000; // 5 minutes
-    protected static long BD_TO_BD_TIMEDIFF_MS = 5000; // 5 seconds
+    protected static long BD_TO_BD_TIMEDIFF_MS = 0; // 0 seconds
     // This the amount of time that we need for a device to move from
     // a non-broadcast domain port to a broadcast domain port.