fix remote reboot feature, it needs -f to work, ref: line 477 of /etc/init

Hi,
I found that reboot feature needs -f to work, you can refer to the line 477 of /etc/init, it will not work if it has no option or parameter, so I sent this pull request to fix it(though benchmark feature is not work in the new version), please merge this commit to fix, thanks!
Peter