plugins/cpu: Use physical ID to determine number of CPUs

Arjen Hiemstrarequested to merge
work/ahiemstra/cpucount into master
  • plugins/cpu: Use physical ID to determine number of CPUs

The ID from the cpu info has no relation to the number of physical CPUs. For that, we need to check the physical ID of the CPU. So use that if it's available. If it's not available, we end up defaulting to 1 CPU which is probably what we want anyway.

BUG: 496847

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