Handy new scripts

- clean_appliance is a little crappy, but works alright
Un-broke testgen parametrizing provider tests

- Also renamed/publicized functions for a more usable interface
Smoke test mark has good reporting, is being used, and can stop a build
pytest.fixture was squashing server_roles.__doc__, docstring moved to module
Merge pull request #560 from seandst/scriptaculous

Handy new scripts
Merge pull request #565 from seandst/actually-using-smoke-marks

Actually using smoke marks
Merge pull request #578 from seandst/provider-parametrization-fixup

Un-broke testgen parametrizing provider tests
Merge pull request #577 from seandst/server-roles-fixture-docs

pytest.fixture was squashing server_roles.__doc__