minion: Reduce unneeded log messages
minion: Reduce unneeded log messages

The minion was outputting warning log messages in situations that
are either expected or not harmful, causing us to fail integration
tests that should have passed. This patch removes this behavior.

mmussomele/quilt,stevenlin598/quilt,LuiseV/quilt,kklin/kelda,PenguinToast/quilt,NetSys/quilt,stevenlin598/quilt,kklin/quilt,kelda/kelda,quilt/quilt,LuiseV/quilt,kayousterhout/quilt,kayousterhout/quilt,kelda/kelda,kayousterhout/quilt,NetSys/quilt,kklin/quilt,mmussomele/quilt,NetSys/quilt,PenguinToast/quilt,ejj/quilt-dev,kayousterhout/quilt,ejj/quilt-dev,tejasmanohar/quilt,tejasmanohar/quilt,LuiseV/quilt,stevenlin598/quilt,ejj/quilt-dev,mmussomele/quilt,kklin/quilt,quilt/quilt,PenguinToast/quilt,kklin/kelda,kelda/kelda,kklin/kelda,tejasmanohar/quilt,stevenlin598/quilt,quilt/quilt,kklin/kelda,LuiseV/quilt,tejasmanohar/quilt,NetSys/quilt,NetSys/quilt,mmussomele/quilt,PenguinToast/quilt,stevenlin598/quilt,PenguinToast/quilt,kelda/kelda,quilt/quilt,stevenlin598/quilt,mmussomele/quilt,ejj/quilt-dev,mmussomele/quilt,kklin/quilt,LuiseV/quilt