feat(packaging): added Restart=on-failure to systemd service spec file

packaging/deb/systemd/grafana-server.service

@@ -9,6 +9,7 @@ EnvironmentFile=/etc/default/grafana-server
 User=grafana
 Group=grafana
 Type=simple
+Restart=on-failure
 WorkingDirectory=/usr/share/grafana
 ExecStart=/usr/sbin/grafana-server                                \
                             --config=${CONF_FILE}                 \

packaging/rpm/systemd/grafana-server.service

@@ -9,6 +9,7 @@ EnvironmentFile=/etc/sysconfig/grafana-server
 User=grafana
 Group=grafana
 Type=simple
+Restart=on-failure
 WorkingDirectory=/usr/share/grafana
 ExecStart=/usr/sbin/grafana-server                                \
                             --config=${CONF_FILE}                 \