Make sure dns gets set to None for private interfaces
Make sure dns gets set to None for private interfaces

prometheanfire/openstack-guest-agents-unix,coreos/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,coreos/openstack-guest-agents-unix,prometheanfire/openstack-guest-agents-unix,prometheanfire/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,coreos/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,coreos/openstack-guest-agents-unix