[cern] k8s: Use ClusterFirstWithHostNet with hostNetwork

upstream: https://review.opendev.org/c/openstack/magnum/+/780255

To not overload the cloud DNS, ClusterFirstWithHostNet is recommended when using hostNetwork.

story: 2008711 task: 42045

Change-Id: Ifc87980dd7e501dbd0fb1d457b3955f6fa34989b Signed-off-by: Spyros Trigazis spyridon.trigazis@cern.ch

magnum/drivers/common/templates/kubernetes/fragments/enable-auto-healing.sh

@@ -212,6 +212,7 @@ spec:
       nodeSelector:
         node-role.kubernetes.io/master: ""
       hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
       tolerations:
         - effect: NoSchedule
           operator: Exists
@@ -329,6 +330,7 @@ spec:
         k8s-app: magnum-auto-healer
     spec:
       hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
       serviceAccountName: magnum-auto-healer
       tolerations:
         - effect: NoSchedule