Ensure setup/teardown dependencies raise an error

[norm]

[dstandish]

i think you may mean, if you define an upstream / downstream relationship between normal and setup, raise?

[norm]

This was taken from the AIP:

It is an error for setup and teardown tasks to have dependencies (This is to allow us to work out the semantics of what multiple setup/teardown should be at a future point, and to reserve deps for this if we want it)