feat(istio): fixes and add simple test

tests/default.nix

@@ -32,6 +32,7 @@ let
           ./k8s/1.13/crd.nix
           ./k8s/submodule.nix
           ./k8s/defaults.nix
+          ./istio/bookinfo.nix
           ./submodules/simple.nix
           ./submodules/defaults.nix
         ];

tests/istio/bookinfo.nix

@@ -0,0 +1,55 @@
+{ config, test, kubenix, k8s, ... }:
+
+with k8s;
+
+{
+  imports = [
+    kubenix.k8s
+    kubenix.istio
+  ];
+
+  test = {
+    name = "istio-bookinfo";
+    description = "Simple istio bookinfo application (WIP)";
+  };
+
+  kubernetes.api."networking.istio.io"."v1alpha3" = {
+    Gateway."bookinfo-gateway" = {
+      spec = {
+        selector.istio = "ingressgateway";
+        servers = [{
+          port = {
+            number = 80;
+            name = "http";
+            protocol = "HTTP";
+          };
+          hosts = ["*"];
+        }];
+      };
+    };
+
+    VirtualService.bookinfo = {
+      spec = {
+        hosts = ["*"];
+        gateways = ["bookinfo-gateway"];
+        http = [{
+          match = [{
+            uri.exact = "/productpage";
+          } {
+            uri.exact = "/login";
+          } {
+            uri.exact = "/logout";
+          } {
+            uri.prefix = "/api/v1/products";
+          }];
+          route = [{
+            destination = {
+              host = "productpage";
+              port.number = 9080;
+            };
+          }];
+        }];
+      };
+    };
+  };
+}