[tests] Use beaker+docker for acceptance tests

Beaker together with docker is a very fast way to do
acceptance testing.
This commit adds basic beaker/docker support:

- Add a debian jessie nodeset
- Test if the module applies idempotentially, so it doesn't
  change resources on a second run with the same parameters.

https://github.com/puppetlabs/beaker/blob/master/docs/Docker-Support.md

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