Re: acme-client: improve account creation error message

[Rafael Possamai]

>please dont drop the all buffer , or keep it with -vv ?
>example : warnx("%s: bad JSON object:%s", p->newaccount, c->buf.buf);
>
>i don't want to ktrace it to see why the new certbot version is not working

Yeah, I think it's good to have the choice to inspect the vomit, maybe you 
stumble upon some useful nuggets for troubleshooting an obscure issue.

I believe the JSON output is valid, just not pretty. Maybe we could add syntax 
highlighting? (just kidding)