Added plugin_cmd tests
Added plugin_cmd tests

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