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tls: Add support for the tls-alpn-01 challenge #2201
Also updates lego/acme to a newer commit on master.
1. What does this change do, exactly?
Adds the TLS-ALPN challenge, which is on by default and uses port 443. Replaces the previously-removed TLS-SNI challenge.
Supports distributed solving just like the HTTP-01 challenge, when used in a fleet configuration. The only requirement is sharing the $CADDYPATH/.acme folder.
2. Please link to the relevant issues.
3. Which documentation changes (if any) need to be made because of this PR?
Update the Automatic HTTPS, CLI, and