flake8 cleanup to protocol_utils
flake8 cleanup to protocol_utils

quantopian/zipline,alphaBenj/zipline,Scapogo/zipline,davidastephens/zipline,chrjxj/zipline,umuzungu/zipline,iamkingmaker/zipline,Scapogo/zipline,gwulfs/zipline,alphaBenj/zipline,ronalcc/zipline,cmorgan/zipline,chrjxj/zipline,keir-rex/zipline,grundgruen/zipline,stkubr/zipline,kmather73/zipline,dmitriz/zipline,MonoCloud/zipline,ronalcc/zipline,kmather73/zipline,nborggren/zipline,StratsOn/zipline,MonoCloud/zipline,StratsOn/zipline,humdings/zipline,ChinaQuants/zipline,quantopian/zipline,otmaneJai/Zipline,jordancheah/zipline,nborggren/zipline,keir-rex/zipline,umuzungu/zipline,erikness/AlephOne,michaeljohnbennett/zipline,bartosh/zipline,davidastephens/zipline,mattcaldwell/zipline,enigmampc/catalyst,DVegaCapital/zipline,gwulfs/zipline,cmorgan/zipline,enigmampc/catalyst,wubr2000/zipline,otmaneJai/Zipline,jimgoo/zipline-fork,semio/zipline,magne-max/zipline-ja,jimgoo/zipline-fork,joequant/zipline,joequant/zipline,wilsonkichoi/zipline,dkushner/zipline,michaeljohnbennett/zipline,ChinaQuants/zipline,dmitriz/zipline,florentchandelier/zipline,CDSFinance/zipline,stkubr/zipline,erikness/AlephOne,magne-max/zipline-ja,humdings/zipline,wubr2000/zipline,YuepengGuo/zipline,zhoulingjun/zipline,AlirezaShahabi/zipline,jordancheah/zipline,YuepengGuo/zipline,dhruvparamhans/zipline,DVegaCapital/zipline,sketchytechky/zipline,CarterBain/AlephNull,zhoulingjun/zipline,wilsonkichoi/zipline,euri10/zipline,dhruvparamhans/zipline,CDSFinance/zipline,semio/zipline,morrisonwudi/zipline,grundgruen/zipline,mattcaldwell/zipline,aajtodd/zipline,CarterBain/AlephNull,iamkingmaker/zipline,dkushner/zipline,bartosh/zipline,sketchytechky/zipline,florentchandelier/zipline,morrisonwudi/zipline,euri10/zipline,aajtodd/zipline,AlirezaShahabi/zipline