Improve kubernetes external name service support for UDP

pkg/provider/kubernetes/crd/fixtures/udp/services.yml

@@ -146,6 +146,43 @@ spec:
     app: traefiklabs
     task: whoamiudp
 
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: external-svc
+  namespace: default
+spec:
+  externalName: external.domain
+  type: ExternalName
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: external.service.with.port
+  namespace: default
+spec:
+  externalName: external.domain
+  type: ExternalName
+  ports:
+    - name: http
+      protocol: TCP
+      port: 80
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: external.service.without.port
+  namespace: default
+spec:
+  externalName: external.domain
+  type: ExternalName
+  ports:
+    - name: http
+      protocol: TCP
+
 ---
 kind: Endpoints
 apiVersion: v1

pkg/provider/kubernetes/crd/fixtures/udp/with_externalname.yml

@@ -0,0 +1,14 @@
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRouteUDP
+metadata:
+  name: test.route
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - services:
+    - name: external-svc
+      port: 8000

pkg/provider/kubernetes/crd/fixtures/udp/with_externalname_with_port.yml

@@ -0,0 +1,14 @@
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRouteUDP
+metadata:
+  name: test.route
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - services:
+    - name: external.service.with.port
+      port: 80

pkg/provider/kubernetes/crd/fixtures/udp/with_externalname_without_ports.yml

@@ -0,0 +1,13 @@
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRouteUDP
+metadata:
+  name: test.route
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - services:
+    - name: external-svc