Add tempest testing

Tempest requires some hiera data. The user detection is probably
fragile. I'm not sure how the networking support is supposed to be
configured or enabled.

Tempest isn't passing at the moment, and takes about 2 hours to run on
my laptop.
Remove the notify that makes changes every run
Merge pull request #14 from hunner/remove_notify

Remove the notify that makes changes every run
Merge pull request #8 from hunner/tempest_stuff

Tempest support