ConnectionBase: factor out #onReqError
ConnectionBase: factor out #onReqError

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