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/master/templates/manifests/kube-apiserver.manifest.j2

@@ -13,6 +13,9 @@ spec:
   hostNetwork: true
 {% if kube_version | version_compare('v1.6', '>=')  %}
   dnsPolicy: ClusterFirst
+{% endif %}
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+  priorityClassName: system-node-critical
 {% endif %}
   containers:
   - name: kube-apiserver

roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2

@@ -12,6 +12,9 @@ spec:
   hostNetwork: true
 {% if kube_version | version_compare('v1.6', '>=') %}
   dnsPolicy: ClusterFirst
+{% endif %}
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+  priorityClassName: system-node-critical
 {% endif %}
   containers:
   - name: kube-controller-manager

roles/kubernetes/master/templates/manifests/kube-scheduler.manifest.j2

@@ -11,6 +11,9 @@ spec:
   hostNetwork: true
 {% if kube_version | version_compare('v1.6', '>=') %}
   dnsPolicy: ClusterFirst
+{% endif %}
+{% if kube_version|version_compare('v1.11.1', '>=') %}
+  priorityClassName: system-node-critical
 {% endif %}
   containers:
   - name: kube-scheduler