RelayRequest: fix log augmentation
RelayRequest: fix log augmentation

chenwenbin928/tchannel,RyanTech/tchannel,vanloswang/tchannel,RyanTech/tchannel,bunnyblue/tchannel,hustxiaoc/tchannel,savaki/tchannel,hustxiaoc/tchannel,i/tchannel,i/tchannel,vanloswang/tchannel,vanloswang/tchannel,i/tchannel,bunnyblue/tchannel,RyanTech/tchannel,savaki/tchannel,chenwenbin928/tchannel,bunnyblue/tchannel,savaki/tchannel,chenwenbin928/tchannel,hustxiaoc/tchannel