Bug 17467: Restart failing, missing instance parameter

Bug 17467: Restart failing, missing instance parameter

This follow up should make it work. Perhaps there is a more
elegant way, but wanted to generate something that works.

Before this patch, the --restart stops Zebra, but does not
restart it. After, it does restart.

Before this patch, the --status gives nasty long help.
After this patch, reasonable output.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>