test/hyperbahn: refactor sub-channel test to work
test/hyperbahn: refactor sub-channel test to work

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