io trace reports missing device model and need units in columns

[jcurrywa]

1. Both JSON and CSV reports device.model are blank
   reports for lba-histogram, latency-histogram and fs statistics are all missing the device.model
   device.id | device.model | device.name | device.size | rangeBegin | rangeEnd | read | write | discard | total
   -- | -- | -- | -- | -- | -- | -- | -- | -- | --
   8388656 |   | sdd | 2147483648 | 1 | 1 |   | 0 |   | 0
   8388656 |   | sdd | 2147483648 | 2 | 3 |   | 0 |   | 0
   8388656 |   | sdd | 2147483648 | 4 | 7 |   | 0 |   | 0

but the Parsed IO Trace to human readable form

device.id	device.model	device.name	device.partition	file.creationDate.nanos	file.creationDate.seconds	file.eventType	file.id	file.offset	file.path	file.size	header.sid	header.timestamp	io.error	io.flush	io.fua	io.ioClass	io.latency	io.lba	io.len	io.operation	io.qd	io.writeHint
8388656	WDC WD4000FYYZ-0	sdd	8388656								1	123222603	FALSE	FALSE	FALSE	22	3264528	2210402464	256	Write	1	0
8388656	WDC WD4000FYYZ-0	sdd	8388656								2	123234707	FALSE	FALSE	FALSE	22	3252604	2210402720	256	Write	2	0
8388656	WDC WD4000FYYZ-0	sdd	8388656								3	123239648	FALSE	FALSE	FALSE	22	3247849	2210402976	256	Write	3	0
8388656	WDC WD4000FYYZ-0	sdd	8388656								4	123245725	FALSE	FALSE	FALSE	22	3241951	2210403232	256	Write	4	0

2. When reporting any data in CSV, please add units where possible to improve the customer experience
   for example
   device.id | device.model | device.name | device.size (sectors) | rangeBegin (ns) | rangeEnd (ns) | read (count) | write (count) | discard | total