Fix fenced server status computation

Co-authored-by: Romain <rtribotte@users.noreply.github.com>

pkg/provider/kubernetes/ingress/fixtures/Ingress-with-endpoint-conditions.yml

@@ -0,0 +1,65 @@
+kind: Ingress
+apiVersion: networking.k8s.io/v1
+metadata:
+  name: ""
+  namespace: testing
+
+spec:
+  rules:
+  - http:
+      paths:
+      - path: /bar
+        backend:
+          service:
+            name: service1
+            port:
+              number: 80
+        pathType: Prefix
+
+---
+kind: Service
+apiVersion: v1
+metadata:
+  name: service1
+  namespace: testing
+
+spec:
+  ports:
+    - port: 80
+  clusterIP: 10.0.0.1
+
+---
+kind: EndpointSlice
+apiVersion: discovery.k8s.io/v1
+metadata:
+  name: service1-abc
+  namespace: testing
+  labels:
+    kubernetes.io/service-name: service1
+
+addressType: IPv4
+ports:
+  - port: 8080
+    name: ""
+endpoints:
+  - addresses:
+      - 10.10.0.1
+      - 10.10.0.2
+    conditions:
+      ready: true
+      serving: true
+      terminating: false
+  - addresses:
+      - 10.10.0.3
+      - 10.10.0.4
+    conditions:
+      ready: false
+      serving: true
+      terminating: true
+  - addresses:
+      - 10.10.0.5
+      - 10.10.0.6
+    conditions:
+      ready: false
+      serving: false
+      terminating: true