awsSpot: Log security group changes at debug
awsSpot: Log security group changes at debug

The current Info logging is overly aggressive and a bit annoying.

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