Remove an obselete msg from then optimize a router test case

Base on Change-ID: I784e9b610f64564861e94d20c6200d1e6915e7f7, the
NOTE is out of date and should be removed. Then base on recently
changing with Change-Id: Ieb211ce48d2368b1f41109c7fd76e818ee69cfe4
we could consider to optimize the code to make it less and improve
readability.

Change-Id: I95dafb51236b16474ec2d349334bb4339b0120ba
1 file changed