cluster: Delete dead 'machine' code
cluster: Delete dead 'machine' code

This has long since been replaced by the database and 'struct machine'

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