Fix goroutine leaks in Close tests
Fix goroutine leaks in Close tests

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