Replace lego with ACMEz #78
Merged
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It works! We dropped about 250 indirect dependencies (but unfortunately, zap adds several) and more than 550 lines of code because we no longer have to resort to hacks to compensate for the underlying API. ACMEz has a much more flexible API and sane configuration. For example, it will try all enabled challenges instead of just the first one; this means if one challenge fails, the next one will be attempted automatically instead of us having to create a new order after re-configuring the client, which also reduces hits against rate-limited endpoints. Yay!
There's still some work to do -- mostly logging and DNS providers -- but that can come soon hereafter.
I also implemented custom resolver support while I was at it.
Closes #71.