add exceptional cases for checking initial statistics of Xfrout
.Xfrout.socket.unixdomain.open should be 1 immediately after Xfrout started. But Stats could not have the latest statistics of Xfrout if it requests until Xfrout is ready for accepting a statistics request from Stats. Thus in that case, Stats would show that .Xfrout.socket.unixdomain.open is 1. For checking exactly that .Xfrout.socket.unixdomain.open is 1 here, it waits for the second time until Stats requests all modules which are Auth, Init, and Xfrout. The Stats configuration "poll-interval" is changed to one second so that timeout in the lettuce test is avoided.