Stop manually handling gateway and dns config
With nmstate 2.2.33 (which is in 9.4) the --kernel option now supports setting the default gateway and dns config. This means we can drop the manual setup work for these from the manifest.
With nmstate 2.2.33 (which is in 9.4) the --kernel option now supports setting the default gateway and dns config. This means we can drop the manual setup work for these from the manifest.