Changes to implement option #2 for the port matching

[bowei]

Example:

apiVersion: policy.networking.k8s.io/v1alpha2
kind: ClusterNetworkPolicy
metadata:
  name: cluster-wide-deny
  spec:
    tier: Admin
    priority: 0
    subject:
      namespaces:
        matchLabels:
          kubernetes.io/metadata.name: sensitive-ns
    ingress:
    - action: Deny
      name: select-all-deny-all
      from:
      - pods:
          namespaceSelector:
            matchLabels: {}
          podSelector:
            matchLabels: {}
      match:
      - tcp:
        - port:
            number: 80
      - udp:
        - port:
            number: 50
      - tcp:
        - port:
            range:
              start: 1000
              end: 1050
      - namedPort: "www"

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[bowei]

I am going to update this to match the NPEP.