OutgoingRequest: use assert for constructor options validation
OutgoingRequest: use assert for constructor options validation

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