Fix problem pod could not resolve external domain from upstream dns w… #931
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…hen nodelocaldns cache enabled
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When nodelocaldns cache enabled, pod cannot resolve domain outside the Kubernetes cluster using upstream dns due to upstream dns not support TCP.
The force_tcp has to be removed to fix this problem. Please refer to the right configmap from upstream https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/nodelocaldns/nodelocaldns.yaml#L100