Add HTTP basic auth support

Further fix the backwards compatibility issue

Merge branch '1.2.8'

Use a dummy chain process for backward compatibility (SteveLTN#131)

Slightly modify the deprecation message

Remove unnecessary chain certs commands

Since ACME v2 would return chained certs already

Fix the issue where cron jobs don't get environment variables

Bugfix: `dockerhost` as upstream didn't work

Because the latest Nginx image used a slimmed down version of Debian, `ip` command was not found.

Bugfix: `dockerhost` as upstream didn't work

Because the latest Nginx image used a slimmed down version of Debian, `ip` command was not found.

Skip virtual dir creation when doing redirection