Fall back to /proc/cpuinfo if lscpu doesn't have CPU totals

[stanhu]

Description

https://github.com/chef/ohai/pull/1454 made lscpu the primary way Ohai gathers CPU data, but the parser doesn't handle the output from a Raspberry Pi 4 Cortex-A72. For example, an ARM cluster has the output Core(s) per cluster instead of Core(s) per socket.

We should fall back to /proc/cpuinfo if we don't get reasonable data back. It's not enough just to have lscpu output.

Related Issue

• https://github.com/chef/ohai/issues/1760
• https://github.com/chef/ohai/issues/1755

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I have run the pre-merge tests locally and they pass.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [ ] All commits have been signed-off for the Developer Certificate of Origin.

[jaymzh]

Ping @stanhu

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[stanhu]

@jaymzh Done, thanks.