spec: Remove `routes` from Network Configuration
spec: Remove `routes` from Network Configuration

- this is supported by some IPAM plugins but is not required of all of
  them

containernetworking/cni,kad/cni,squeed/plugins,rosenhouse/cni,mcastelino/cni,tangle329/cni,tangle329/cni,rosenhouse/cni,squeed/plugins,dcbw/cni,mcastelino/cni,containernetworking/plugins,appc/cni,containernetworking/cni,kad/cni,dcbw/cni,containernetworking/plugins,appc/cni