Currently in a systemd based init, the httpd server is not launched. A
systemd service is needed, so add it.
Also install a CGI script that allows to use the device for the
NetworkManager connectivity check.
https://jira.digi.com/browse/DEL-6577
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Javier Viguera