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/dnsmasq/templates/dnsmasq-autoscaler.yml.j2

@@ -31,6 +31,9 @@ spec:
         scheduler.alpha.kubernetes.io/critical-pod: ''
         scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
     spec:
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+      priorityClassName: system-cluster-critical
+{% endif %}
       serviceAccountName: dnsmasq
       tolerations:
         - effect: NoSchedule