skyring-setup.sh: use systemd commands
skyring-setup.sh: use systemd commands

Avoid using the deprecated SysV operations and use systemd instead.

Change-Id: I60179caaf093a29bada0dc16d092aee3591b0cf2
Signed-off-by: Ken Dreyer <940dddfbf8b0685439b7ecf27daa0ba58b359a2c@redhat.com>

skyrings/skyring,skyrings/skyring,skyrings/skyring,skyrings/skyring