Touch the machine-id file
    
    So is seems that if you remove the machine-id file it won't regenerate the file
    but if you touch the file and leave it empty on boot it'll put a new machine-id
    in the empty file. So work around this bug ("feature"?) by touching the file
    so we don't have other issues in the process.
    
    We're track the outcome of this in RHBZ 1379800