Replace DEVICESCAN by something more flexible

[chrfranke]

It would be more flexible if names with wildcards and multiple names in a line could be specified in smartd.conf. For example:

 /dev/sdb /dev/sdc /dev/sdd -d scsi -a
 /dev/sda /dev/sd[e-h]      -d sat -a
 /dev/sd[a-z]               -a

If duplicate devices appear in the expanded list, the first one should take precedence.