Bump zonal GKE version

Author: Jberlinsky

examples/simple_zonal/main.tf

@@ -34,8 +34,8 @@ module "gke" {
   subnetwork         = "${var.subnetwork}"
   ip_range_pods      = "${var.ip_range_pods}"
   ip_range_services  = "${var.ip_range_services}"
-  kubernetes_version = "1.11.4-gke.8"
-  node_version       = "1.11.4-gke.8"
+  kubernetes_version = "1.11.4-gke.13"
+  node_version       = "1.11.4-gke.13"
   service_account    = "${var.compute_engine_service_account}"
 }
 

test/integration/simple_zonal/controls/gcloud.rb

@@ -43,7 +43,7 @@
       end
 
       it "has the expected initial cluster version" do
-        expect(data['initialClusterVersion']).to eq "1.11.4-gke.8"
+        expect(data['initialClusterVersion']).to eq "1.11.4-gke.13"
       end
 
       it "has the expected addon settings" do
@@ -80,7 +80,7 @@
       it "is running the expected version of Kubernetes" do
         expect(node_pools).to include(
           including(
-            "version" => "1.11.4-gke.8",
+            "version" => "1.11.4-gke.13",
           )
         )
       end