package/sysklogd: allow customisation in systemd service
As is done with the init script, parse the system-level customisation
file, if it exists, from the systemd service unit, to allow users to
provide extra arguments passed to the daemon.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
[yann.morin.1998@free.fr; offload to its own commit]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>