Fixing egress network policy labels

This MR fixes label selectors for ingress host to allow running notebooks to reach Hub in the cluster.

common/deployments/hub-production.yaml

@@ -45,9 +45,9 @@ singleuser:
         - namespaceSelector:
             matchLabels:
               kubernetes.io/metadata.name: kube-system
-          serviceSelector:
+          podSelector:
             matchLabels:
-              k8s-app: cluster-ingress
+              app.kubernetes.io/instance: cluster-ingress
   image:
     name: eginotebooks/single-user-eosc
     tag: "sha-d822021"