Adding pod priority for all the components. (#3361)

* Changes to assign pod priority to kube components.

* Removed the boolean flag pod_priority_assignment

* Created new priorityclass k8s-cluster-critical

* Created new priorityclass k8s-cluster-critical

* Fixed the trailing spaces

* Fixed the trailing spaces

* Added kube version check while creating Priority Class k8s-cluster-critical

* Moved k8s-cluster-critical.yml

* Moved k8s-cluster-critical.yml to kube_config_dir

roles/network_plugin/cilium/templates/cilium-ds.yml.j2

@@ -34,6 +34,9 @@ spec:
         prometheus.io/port: "9090"
 {% endif %}
     spec:
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+      priorityClassName: system-node-critical
+{% endif %}
       serviceAccountName: cilium
       initContainers:
         - name: clean-cilium-state