Fix more bugs
Fix more bugs

  * setting --dry-run or --staging implies changing account
  * --dry-run: be willing to make a staging account if the user only
    has a prod one

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