Update nginx to 1.15. Update manifest and performance optimize (#4458)

roles/kubernetes/node/templates/manifests/nginx-proxy.manifest.j2

@@ -4,6 +4,7 @@ metadata:
   name: nginx-proxy
   namespace: kube-system
   labels:
+    addonmanager.kubernetes.io/mode: Reconcile
     k8s-app: kube-nginx
 spec:
   hostNetwork: true
@@ -17,9 +18,6 @@ spec:
     image: {{ nginx_image_repo }}:{{ nginx_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
     resources:
-      limits:
-        cpu: {{ nginx_cpu_limit }}
-        memory: {{ nginx_memory_limit }}
       requests:
         cpu: {{ nginx_cpu_requests }}
         memory: {{ nginx_memory_requests }}
@@ -30,6 +28,10 @@ spec:
       httpGet:
         path: /healthz
         port: {{ nginx_kube_apiserver_healthcheck_port }}
+    readinessProbe:
+      httpGet:
+        path: /healthz
+        port: {{ nginx_kube_apiserver_healthcheck_port }}
     {% endif -%}
     volumeMounts:
     - mountPath: /etc/nginx