cilium: k8s-1.13-net-next CI: DNS entry is not ready after timeout

/home/jenkins/workspace/Cilium-PR-K8s-1.13-net-next/src/github.com/cilium/cilium/test/ginkgo-ext/scopes.go:514
DNS entry is not ready after timeout
Expected
    <*errors.errorString | 0xc001e0c2a0>: {
        s: "DNS 'productpage.default.svc.cluster.local' is not ready after timeout: 7m0s timeout expired",
    }
to be nil
/home/jenkins/workspace/Cilium-PR-K8s-1.13-net-next/src/github.com/cilium/cilium/test/k8sT/Services.go:2937

https://jenkins.cilium.io/job/Cilium-PR-K8s-1.13-net-next/418/

500d4631_K8sServicesTest_Bookinfo_Demo_Tests_bookinfo_demo.zip

Split out of #13833 as suggested in https://github.com/cilium/cilium/issues/13833#issuecomment-758292182. This is a different failure which occurs on net-next, not GKE. The root cause seems to be something else.