Ensure nvme_exporter can work with nvme-cli v2.11 #2
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Newer versions of nvme-cli have different output formats to JSON. The JSON can also change, depending on how many nvme controllers are present. This works with all current releases. Added some basic unittests to ensure that conversions/JSON parsing is good.
This also gives the ability to change the temperature exporter, to Kelvin (as per NVMe spec), Celcius (as per Prometheus node_exporter and other tools), and Fahrenheit (used in some environments).