bug: the first RPC will timeout after kill-restart

[Runji Wang]

https://github.com/huang-jl/madsim-bug/blob/main/src/lib.rs

[ WARN][0.114723s][0.0.0.0:0][madsim_test::tests] Server crash!
[ WARN][5.114723s][0.0.0.0:0][madsim_test::tests] Server restart!
[ INFO][10.114723s][10.0.0.2:1234][madsim_test] Send Incr request from 10.0.0.2:1234 to 10.0.0.1:8000
[ WARN][11.114723s][10.0.0.2:1234][madsim_test] Send incr fail: RPC timeout  <---
[ INFO][11.114723s][10.0.0.2:1234][madsim_test] Send Incr request from 10.0.0.2:1234 to 10.0.0.1:8000
[ INFO][11.124569s][10.0.0.1:8000][madsim_test] Receive increment request, local addr = 10.0.0.1:8000
[ INFO][11.128317s][10.0.0.2:1234][madsim_test] Send incr success

[Runji Wang]

The reason is that we didn't clear the network status on restart, so the first recv operation after restart got the message before kill immediately, then the sender got timeout.