Prefer to use containerPort to export service node port

[yandongxiao]

Describe the current behavior

When user want to export service node port, It should write following conf:

  service:
    type: NodePort
    ports:
      - name: http-port   # fill the name from the fe proxy service ports
        containerPort: 8080
        nodePort: 30180
        port: 8080

name is required field, and must keep the same with the name defined in k8s service.

But If users Start from scratch, they do not know the port.name.

Describe the enhancement

If user specify containerPort and name, first use containerPort to match, then use name.