v2/tracing: switch to a custom RW
v2/tracing: switch to a custom RW

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