The FreeBSD project stopped publishing HTTP date headers and seeks to
limit further resource taxing by distributed htpdate clients using the
www.freebsd.org host as default time source.

Fixes: #17924
Reported-by: Allan Jude <allanjude@freebsd.org>
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Modify init script to use standard uci configuration and procd for
process management. We benefit from:
- use of standard LEDE configuration with its ability to revert and
  commit changes
- validation of configuration variables
- procd taking care of restarting daemon when config changes and user
  wants to reload it
- automatic respawning of daemon process in case it dies

The source is patched to make it possible to run as a daemon in
foreground.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>