Feature folders inside files

[fscaptain]

enables the use of a folder structure within files/ for more clarity and structure for custom configuration files.

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[fscaptain]

Thank you for your pull request. Before we can look at it, you'll need to sign a Contributor License Agreement (CLA).

Please follow instructions at https://icinga.com/company/contributor-agreement to sign the CLA.

After that, please reply here with a comment and we'll verify.

Contributors that have not signed yet: @fscaptain

* If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Please [contact us](https://icinga.com/company/contact/) if you think this is the case.

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CLA signed.

[fscaptain]

CLA signed.

[bobapple]

@cla-bot check

[mkayontour]

Hi, thanks for the PR. This seems to be a reasonable way to structure files in the files directory.

Can you add a changelog fragments as described in the following document? CONTRIBUTING.md

[fscaptain]

Hi, thanks for the PR. This seems to be a reasonable way to structure files in the files directory.

Can you add a changelog fragments as described in the following document? CONTRIBUTING.md

Done.