Add read_file tests
Add read_file tests

mrb/letsencrypt,VladimirTyrin/letsencrypt,TheBoegl/letsencrypt,thanatos/lets-encrypt-preview,VladimirTyrin/letsencrypt,Sveder/letsencrypt,DavidGarciaCat/letsencrypt,piru/letsencrypt,mitnk/letsencrypt,goofwear/letsencrypt,DavidGarciaCat/letsencrypt,piru/letsencrypt,lmcro/letsencrypt,xgin/letsencrypt,jtl999/certbot,jsha/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,bsmr-misc-forks/letsencrypt,stweil/letsencrypt,martindale/letsencrypt,twstrike/le_for_patching,lbeltrame/letsencrypt,mitnk/letsencrypt,sjerdo/letsencrypt,bsmr-misc-forks/letsencrypt,brentdax/letsencrypt,letsencrypt/letsencrypt,martindale/letsencrypt,kuba/letsencrypt,dietsche/letsencrypt,TheBoegl/letsencrypt,wteiken/letsencrypt,sjerdo/letsencrypt,kuba/letsencrypt,jtl999/certbot,dietsche/letsencrypt,mrb/letsencrypt,goofwear/letsencrypt,wteiken/letsencrypt,lbeltrame/letsencrypt,thanatos/lets-encrypt-preview,Sveder/letsencrypt,twstrike/le_for_patching,brentdax/letsencrypt,lmcro/letsencrypt,xgin/letsencrypt,stweil/letsencrypt