handle legacy http01_port value
handle legacy http01_port value

jsha/letsencrypt,dietsche/letsencrypt,wteiken/letsencrypt,thanatos/lets-encrypt-preview,brentdax/letsencrypt,thanatos/lets-encrypt-preview,jtl999/certbot,dietsche/letsencrypt,bsmr-misc-forks/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,jtl999/certbot,brentdax/letsencrypt,lmcro/letsencrypt,DavidGarciaCat/letsencrypt,bsmr-misc-forks/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,letsencrypt/letsencrypt,wteiken/letsencrypt,DavidGarciaCat/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,lmcro/letsencrypt