Add config option to disable dmidecode

[jorgemarey]

Fixes #19468

[tgross]

This looks great @jorgemarey! I've left a few small comments but once those are resolved this should be good to merge. I've also pulled down this branch and built locally for testing.

Without cpu_disable_dmidecode set:

$ sudo execsnoop.bt | grep dmidecode
10:21:00.480806 218150  218128  /usr/sbin/dmidecode -t 4

$ nomad operator api /v1/agent/self |  jq '.config.Client.CpuDisableDmidecode'
false

With cpu_disable_dmidecode = true:

$ $ sudo execsnoop.bt | grep dmidecode
^C

$ nomad operator api /v1/agent/self | jq '.config.Client.CpuDisableDmidecode'
true

👍

[aimeeu]

@jorgemarey Thank you for updating the docs!

[tgross]

LGTM! I'll merge this once CI is green and get it backported to the 1.9.x series. Thanks @jorgemarey!