Differentiate between partitions and devices using sysfs #1312
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disk_io_counters skips devices that have partitions, and to differentiate partitions from devices we can't use the names - we need to look in sysfs.
Partitions and devices have entries in /sys/class/block and only devices have entries in /sys/block.
This should fix issues #1244 and #1305.
Also fixed looking up the sector size of partitions.