pppd: Start the daemon and wait for an established connection.

pppd: Start the daemon and wait for an established connection.

Thanks to Lennart Poettering for advice how to solve this problem.

pppd now will be started by systemd and try to establish the connection.
systemctl start ... will block until the connection was established
(i.e. pppd forked into the background) or pppd exited.

The exit code will then be retrieved by systemctl show for
further processing.