Refactor TestTracingPropagates to use json package to clean up test
Refactor TestTracingPropagates to use json package to clean up test

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