Use correct DMI attribute name for product name

[ramereth]

I discovered that ohai was incorrectly detecting our OpenStack guests showing
the following output:

{
  "systems": {

  }
}

With this change, it correctly shows the following output:

{
  "systems": {
    "openstack": "guest"
  },
  "system": "openstack",
  "role": "guest"
}

The problem was the fact that dmi/system/product was the incorrect attribute and
should be dmi/system/product_name instead.

Signed-off-by: Lance Albertson lance@osuosl.org

Description

Related Issue

Types of changes

• 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:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• 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.