connectivity: include k8s-app=coredns matchLabels #698
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A few policy tests explicitly allow egress to CoreDNS, using an ancient
label selector that can't necessarily be relied on. Interestingly, some
of the tests (such as client-egress-to-fqdns-one-one-one-one), already had
network policies that included a label selector for k8s-app=coredns
in addition to k8s-app=kube-dns, but not all.
resolves #697