HEAD-470: create a log/latest symlink to the latest usb-headnode build log for convenience
HEAD-470: create a log/latest symlink to the latest usb-headnode build log for convenience

kaizengarden/sdc-headnode,numericillustration/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode