minion/engine: Remove untrue warning in unit test
minion/engine: Remove untrue warning in unit test

There was a note in the engine unit test that is no longer true now that
port placement rules are generated in the engine.

kklin/quilt,NetSys/quilt,kklin/kelda,NetSys/quilt,LuiseV/quilt,kklin/kelda,quilt/quilt,kayousterhout/quilt,ejj/quilt-dev,quilt/quilt,kklin/quilt,NetSys/quilt,quilt/quilt,kklin/kelda,kelda/kelda,kelda/kelda,kayousterhout/quilt,quilt/quilt,LuiseV/quilt,LuiseV/quilt,kelda/kelda,ejj/quilt-dev,ejj/quilt-dev,NetSys/quilt,kklin/quilt,LuiseV/quilt,kayousterhout/quilt,kklin/quilt,ejj/quilt-dev,kayousterhout/quilt,kklin/kelda,NetSys/quilt,LuiseV/quilt,kelda/kelda