For configurations where another web server is running on port 80, running
acme.sh in standalone mode fails. Try to detect this and refuse to run; and
allow the user to configure a webroot directory to use the running webserver for
certificate verification.

This also updates acme.sh to the latest version.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

Use newest acme.sh release (2.6.8).
Remove dependency on ca-certificates and add dependency on ca-bundle.
Update environment variable.

Signed-off-by: Daniel Halmschlager <da@halms.at>

This updates to the latest git version of acme.sh and drops the patch to
disable timestamps from the output (since that is now supported
upstream).

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

This version handles transitioning from a previous certificate that was
issues using the staging server, adds more debug logging, and handles
state directories better if issuing fails.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

This version will use the standalone (netcat) mode of acme.sh during
verification instead of exposing uhttpd to the internet for the duration
of the verification. It will also add an ip6tables rule to also support
verification over IPv6.

Also contains an updated version of acme.sh.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

This adds a package wrapping the acme.sh script from
https://github.com/Neilpang/acme.sh in Uci config and hooks to interact
correctly with uhttpd.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>