[Security] Disable unused background services: wpa_supplicant and cups.

[gmarciani]

Description of changes

Disable unused background services: wpa_supplicant and cups.

Tests

• Build image succeeded for all OSes
• Spec test disable_services_spec.rb
• ONGOING Kitchen test

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
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Checklist

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[himani2411]

Wont this run on all of the OSSes? Would this give us any failures for cups or wpa_supplicant not found for other Osses?

[gmarciani]

I expect not to cause failures because the disablement should be resilient if service is not found, but waiting for tests to finish to verify

[gmarciani]

In any case I agree that the best practice is to split the recipe in OS-specific recipes.