ovs: Bundle newest DigitalOcean kernel version
ovs: Bundle newest DigitalOcean kernel version

The Ubuntu image provided by DigitalOcean now uses the linux kernel
version 4.4.0-83.

kayousterhout/quilt,kklin/quilt,NetSys/quilt,kklin/kelda,NetSys/quilt,kayousterhout/quilt,ejj/quilt-dev,kayousterhout/quilt,LuiseV/quilt,ejj/quilt-dev,kayousterhout/quilt,kklin/kelda,LuiseV/quilt,LuiseV/quilt,quilt/quilt,ejj/quilt-dev,kelda/kelda,quilt/quilt,LuiseV/quilt,quilt/quilt,kklin/quilt,kelda/kelda,NetSys/quilt,kklin/quilt,kelda/kelda,NetSys/quilt,kklin/quilt,LuiseV/quilt,kklin/kelda,NetSys/quilt,kelda/kelda,kklin/kelda,quilt/quilt,ejj/quilt-dev