Add ReferencePolicy to allow cross-namespace routing (#55)

* Add ReferencePolicy to allow cross-namespace routing

* Remove namespace designation, update name

Other resources being deployed to not explicitly specify the namespace that they should be deployed into. This change updates the ReferencePolicy to behave the same way.

api-gateway/two-services/referencepolicy.yaml

@@ -0,0 +1,12 @@
+apiVersion: gateway.networking.k8s.io/v1alpha2
+kind: ReferencePolicy
+metadata:
+  name: example-reference-policy
+spec:
+  from:
+    - group: gateway.networking.k8s.io
+      kind: HTTPRoute
+      namespace: consul  # Must match the namespace that api-gw/routes.yaml is deployed into
+  to:
+    - group: ""
+      kind: Service