Support InSpec attributes

[chris-rock]

InSpec introduced a new feature called attributes with InSpec 1.0 inspec/inspec#719. At this point, kitchen-inspec does not support this feature. My expectation is, that attributes work across the Chef tool chain.

a simple attribute https://github.com/chef/inspec/blob/master/examples/profile-attribute.yml file looks like

user: bob
password: secret

To support attributes in kitchen.yml, we could do the following:

suites:
  - name: default
    verifier:
      inspec_tests:
        - https://github.com/dev-sec/tests-ssh-hardening
      attributes:
        user: bob
        password: secret

Not sure if we want to support external yml files?

[gsaslis]

👍

also 👍 on the external yml files (in fact, I would even give this preference over the inline attributes declaration)

[chris-rock]

Related to #97

[chris-rock]

Fixed via #116