Fix the disk type monitor info of nvme-ssd missed from node_exporter

[SeanHai]

The metric from node_exporter: https://github.com/prometheus/node_exporter/blob/master/collector/fixtures/e2e-64k-page-output.txt

There are some metrics about disk type and disk write cache:

It works on SATA SSD, but missed on Nvme SSD, you can find the reason and fix it.

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[0fatal]

hi, I'm a student majoring in software engineering in hdu, who is interested in distributed system. I'm good at golang and javascript. Familiar at prometheus and as a change to learn storage system, I wish to contribute to this task.