features: Remove boilerplate

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
features: Fix indentation

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
features: Rename 'step_definitions' to 'steps'

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
features: Use Aruba

Aruba provides much of the test infrastructure currently implemented by
ourselves. Convert tests to use Aruba.

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>