config: Replace file watching with a simple poll loop.
config: Replace file watching with a simple poll loop.

The file watching code was verbose and error prone.  This is much
simpler and works just about as well.

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