* Bring `ensure_origin` and `origins` to caddyfile admin config
* Add unit test for caddyfile admin config update
* Add caddyfile adapt test for typical admin setup
* httpcaddyfile: Replace admin config error message when there's more arguments than needed
Replace d.Err() to d.ArgErr() since the latter provides similarly informative error message
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
