prometheus-node-exporter-lua: respawn the process

Signed-off-by: Andre Heider <a.heider@gmail.com>

utils/prometheus-node-exporter-lua/files/etc/init.d/prometheus-node-exporter-lua

@@ -41,6 +41,7 @@ start_service() {
 
 	procd_set_param stdout 1
 	procd_set_param stderr 1
+	procd_set_param respawn
 
 	procd_close_instance
 }