network: Remove all concurrency from worker
network: Remove all concurrency from worker

In our continuing quest to stop the docker deadlock, we are
temporarily removing concurrency from minion/network/worker.go.  It
should be added back later.

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