Specify inspec output format from kitchen.yml

[cheesesashimi]

This implements #26

[chef-supermarket]

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[irvingpop]

thanks for adding this @cheesesashimi ! We'll need to get you added to the IBM CCLA in order to satisfy currybot.

One bit of feedback, I'm surprised the test here didn't break: https://github.com/chef/kitchen-inspec/blob/master/spec/kitchen/verifier/inspec_spec.rb#L145 - recommend some additional test coverage for specifying a formatter

Also paging @chris-rock for review

[chris-rock]

@cheesesashimi Thanks for this great addition. This is a great user-facing improvement. Could you add a test to verify that the format is set properly. I am also thinking about adding some documentation about the available flags. What do you think. Let me know if you need help.

@irvingpop This is caused by the fact, that format is optional. Could you make sure with @cheesesashimi that we have a CCLA or CLA signed?

[cheesesashimi]

@chris-rock I'll write a test to verify correct formatting and I'd appreciate any feedback once I've attached it since I admit I'm pretty new to Ruby and rspec, in general :). As far as available flags are concerned, aside from --format, --id is another one that I could see someone setting through an env variable provided from their CI system. I'm happy to add that to this pull request as well.

@irvingpop I received an e-mail confirmation that I was added to IBM's CCLA, so I should be good to go unless I also need a signed ICLA as well?

[chef-supermarket]

Hi. Your friendly Curry bot here. Just letting you know that all commit authors have become authorized to contribute. I have added the "Signed CLA" label to this issue so it can easily be found in the future.

[chris-rock]

@cheesesashimi Thanks for adding the test. Lets tackle the id in another PR.