Kill all tasks on shutdown and startup

BindsTo will kill all the tasks when systemctl stop box is executed.
But when restarted, it keeps the tasks running. Because of this behavior,
we kill the tasks on startup and stop of the box code.

src/scripts/clearvolume.sh

@@ -37,4 +37,4 @@ if [[ "${cmd}" == "clear" ]]; then
 else
     # this make not succeed if volume is a mount point
     rmdir "${volume_dir}" || true
-fi
+fi