Add new crd to convert kubesphere network policy to k8s network policy, and then other network
plugin will do the rest work.
Use cache.go from calico project's kube-controller, it aim to sync nsnp with k8s np, delete unused np, and relieve the pressure on k8s restful client.
If you want higher performance, you can implement interface NsNetworkPolicyProvider in pkg/controller/provider/namespace_np.go.
Signed-off-by: Duan Jiong <djduanjiong@gmail.com>
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