fix(kubernetes/node): use numeric priority for static pods (#13490)

Signed-off-by: Jules Skrill <julesskrill@gmail.com>

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

@@ -144,6 +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 #}
+  priority: 2000001000
   volumes:
   - hostPath:
       path: /etc/kubernetes/{{kube_vip_admin_conf}}