Set priorityClassName and priority on static pods (#13580)

With priority only (#13490), the API server rejects the mirror pods
and the kubelet does not give the pods the node-critical OOM score.
Set both fields, like kubeadm does for its static pods.

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>
Co-authored-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>

roles/kubernetes/node/templates/manifests/kube-vip.manifest.j2

@@ -144,10 +144,10 @@ spec:
     - kubernetes
     ip: 127.0.0.1
   hostNetwork: true
-{# Static pods do not support priorityClassName, so set the numeric priority of
-   system-node-critical directly, otherwise kubelet may evict this pod early:
-   https://kubernetes.io/docs/concepts/scheduling-eviction/node-pressure-eviction/#pod-selection-for-kubelet-eviction #}
+{# Set both, like kubeadm. The kubelet does not resolve priorityClassName for static pods,
+   and the API server rejects the mirror pod when priority does not match the class. #}
   priority: 2000001000
+  priorityClassName: system-node-critical
   volumes:
   - hostPath:
       path: /etc/kubernetes/{{kube_vip_admin_conf}}