Add integration tests and move errands back to deployments controller

- Add integration tests for listing errands
- Add unit tests for listing errands to deployments controller spec
- Move listing errands to deployments controller

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Refactor deployments and errands spec to use expect syntax

- Refactor deployments spec to use expect syntax
- Refactor errands integration test to use expect syntax
- Refactor errands integration test to be slightly faster

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>