[discussion] get latest vpc data from k8s api instead of cache

[chestack]

In InitDefaultVpc(), default vpc was created and then updated with vpc.Status.Default = true

func (c *Controller) InitDefaultVpc() error {
		orivpc = &kubeovnv1.Vpc{}
	        orivpc.Name = util.DefaultVpc
                orivpc, err = c.config.KubeOvnClient.KubeovnV1().Vpcs().Create(context.Background(), orivpc, metav1.CreateOptions{})
        ...
        vpc.Status.Standby = true
        vpc.Status.Default = true
	_, err = c.config.KubeOvnClient.KubeovnV1().Vpcs().Patch(context.Background(), vpc.Name, types.MergePatchType, bytes, metav1.PatchOptions{}, "status")
}

Found that the following code returned the default vpc data with vpc.Status.Default = false occasionally.

func (c *Controller) handleAddOrUpdateVpc(key string) error {
      orivpc, err := c.vpcsLister.Get(key)

Maybe the reason is orivpc, err := c.vpcsLister.Get(key) get vpc from local informer cache but not k8s-api so it's possible get stale vpc info.