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/kubernetes-apps/ingress_controller/cert_manager/templates/deploy-cert-manager.yml.j2

@@ -22,6 +22,9 @@ spec:
         release: cert-manager
       annotations:
     spec:
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+      priorityClassName: {% if cert_manager_namespace == 'kube-system' %}system-cluster-critical{% else %}k8s-cluster-critical{% endif %}{{''}}
+{% endif %}
       serviceAccountName: cert-manager
       containers:
         - name: cert-manager