Yocto Project family and Yocto Linux and balenaOS platform detection

[mattray]

Add support for Yocto Project Linux family of Linuxes. Yocto is an embedded Linux and balenaOS is a Yocto-derived platform.

[chef-expeditor]

Hello mattray! Thanks for the pull request!

Here is what will happen next:

1. Your PR will be reviewed by the maintainers.
2. Possible Outcomes
   a. If everything looks good, one of them will approve it, and your PR will be merged.
   b. The maintainer may request follow-on work (e.g. code fix, linting, etc). We would encourage you to address this work in 2-3 business days to keep the conversation going and to get your contribution in sooner.
   c. Cases exist where a PR is neither aligned to Chef InSpec's product roadmap, or something the team can own or maintain long-term. In these cases, the maintainer will provide justification and close out the PR.

Thank you for contributing!

[codeclimate]

Code Climate has analyzed commit ad9a706 and detected 22 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Style	22

View more on Code Climate.

[miah]

Thanks @mattray

[clintoncwolfe]

Thank you!