go: fix for ping example failing because server has not yet started.
go: fix for ping example failing because server has not yet started.

savaki/tchannel,vanloswang/tchannel,sasa233/tchannel,benfleis/tchannel,savaki/tchannel,RyanTech/tchannel,benfleis/tchannel,chenwenbin928/tchannel,bunnyblue/tchannel,bunnyblue/tchannel,sasa233/tchannel,RyanTech/tchannel,i/tchannel,benfleis/tchannel,Zirpon/tchannel,hustxiaoc/tchannel,i/tchannel,savaki/tchannel,hustxiaoc/tchannel,vanloswang/tchannel,bunnyblue/tchannel,sasa233/tchannel,i/tchannel,Zirpon/tchannel,vanloswang/tchannel,hustxiaoc/tchannel,RyanTech/tchannel,chenwenbin928/tchannel,Zirpon/tchannel,chenwenbin928/tchannel