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Merge pull request #1203 from davecheney/222-add-check-that-apiserver-params-does-not-depend-on-state

apiserver/params: add test to prevent state being added as dependency

`apiserver/params` should not depend, even transitively on `state`, because that will mean anything that uses the api also has a state in their dependency graph.

This test makes it a robot's job to check.

Requires #1202 

(Review request: http://reviews.vapour.ws/r/513/)