Add Gentoo support

[lordievader]

The agent service name is now defined in the params.pp as well since it is different on Gentoo.

Pull Request (PR) description

It introduces variables for Gentoo. Additionally it replaces the hardcoded agent service name with one from params.pp (which is also OS dependend).
This PR does not fix the repo not bein supported on Gentoo warning. However, the agent can be used without managing the repo as well.

This Pull Request (PR) fixes the following issues

Fixes #531

[lordievader]

Oh, I have not had the chance to test it with Beaker. If this is necesarry I'll set it up again, but in all honesty I rather not ;)

[bastelfreak]

Hey @lordievader, thanks for the PR. Do you think you can contribute (at least facter2.5) facts from a gentoo instance to https://github.com/camptocamp/facterdb/tree/master/facts/2.5 ? Beaker-docker currently has no support for gentoo, so we need to stick with the unit tests. Please add Gentoo to the metadata.json. Afterwards our testsetup will check facterdb for mocked gentoo facts and execute the tests against it.

[bastelfreak]

Just if you're interested: You could contribute gentoo compatibility to https://github.com/puppetlabs/beaker-puppet. I am happy to help if you're interested. You can reach the Vox Pupuli people almost 24/7 in #voxpupuli on the freenode IRC network or on https://puppetcommunity.slack.com

[baurmatt]

Failing tests due to https://tickets.puppetlabs.com/browse/MODULES-7802

Edit: We're also interested in this PR! @bastelfreak Do you think it's really necessary to add Gentoo facts to facterdb, wait for the facterdb release and add spec tests? Although I support the Gentoo support of facterdb, this seems like a little bit to much overhead

[bastelfreak]

the facterdb update isn't required, but it would be very very helpful.

[lordievader]

I suppose my lazyness payed off. Thanks @baurmatt 🗡️
@bastelfreak Is this enough to get this merged into master?

I'd still want to contribute to beaker-puppet, just haven't had time to setup a proper beaker environment yet.

[bastelfreak]

Hi @lordievader, can you add Gentoo to the metadata.json? Afterwards we can merge this.

[lordievader]

Hi @bastelfreak, Gentoo has been added to metadata.json. The PR has been rebased on the current master and everything has been squashed into one commit.

[bastelfreak]

Thanks!