DO NOT MERGE: CHEF-12879 Kitchen integration with InSpec 6

[Nik08]

DO NOT MERGE:

• Merge and release this PR after test-kitchen changes with licensing are released.
• Test kitchen changes are dependent on release of licensing changes of Infra tracked here https://github.com/chef/chef/pull/14467

Description

• Upgrade Inspec version to major version 6
• Enable the ability to set chef_license_key using Kitchen
• Enable the ability to set chef_license_server using Kitchen

Via Kitchen kitchen.yaml To configure verifier block with chef_license_key :

verifier:
  name: inspec
  chef_license_key: LICENSE_KEY

To configure verifier block with chef_license_server :

Multiple URLS

verifier:
  name: inspec
  chef_license_key: LICENSE_KEY
  chef_license_server:
    - https://test-url-1
    - https://test-url-2

Or

Single URL

verifier:
  name: inspec
  chef_license_key: LICENSE_KEY
  chef_license_server: https://test-url-1

Check List

• [ ] New functionality includes tests
• [ ] All tests pass
• [ ] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco
• [ ] PR title is a worthy inclusion in the CHANGELOG