improve smartd reporting

[thinrope]

Current smartd reports send by mail only list device name (e.g. /dev/sdc) which is not enough to easily identify the problematic disk.

It will be better to add some more info to the report, e.g. something like:

The following warning/error was logged by the smartd daemon:

Device: /dev/sdc [SAT], 4 Offline uncorrectable sectors

-----------

Device Model: WDC WD20EARS-00MVWB0
Serial Number: WD-WMAZ2026xxxxx
User Capacity: 2,000,398,934,016 bytes [2.00 TB]

(above is easily obtained by smartctl -i /dev/sdc |egrep "Device Model|Serial Number|User Capacity")

[Christian Franke]

See ticket #185.