dynk8s: Fix Ingress routing

I guess I thought `defaultBackend` was scoped to the TLS host, but it
appears to be global, across all Ingress resources in the cluster.
Thus, it really doesn't make any sense for any Ingress to have a default
backend, and certainly not the dynk8s provisioner.

dynk8s-provisioner/dynk8s-provisioner.yaml

@@ -284,11 +284,17 @@ spec:
   tls:
   - hosts:
     - dynk8s-provisioner.pyrocufflink.net
-  defaultBackend:
+  rules:
+  - host: dynk8s-provisioner.pyrocufflink.net
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
           service:
             name: dynk8s-provisioner
             port:
-        number: 8000
+              name: http
 
 ---
 apiVersion: v1