systemd: remove tcmu-runner restart behaviour
systemd: remove tcmu-runner restart behaviour

currently, tcmu-runner restarts on failure, i.e the process comes back
alive without manual intervention in case of any failure/error/crash

Also the failure will not be noticed by user as systemd restarts immediately.

This patch removes 'Restart=on-failure' from systemd unit file.

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

open-iscsi/tcmu-runner,open-iscsi/tcmu-runner,agrover/tcmu-runner