add manifest for NEG e2e test

test/e2e/testing-manifests/ingress/neg/ing.yaml

+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: hostname
+spec:
+  backend:
+    serviceName: hostname
+    servicePort: 80
\ No newline at end of file

test/e2e/testing-manifests/ingress/neg/rc.yaml

+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    run: hostname
+  name: hostname
+spec:
+  template:
+    metadata:
+      labels:
+        run: hostname
+    spec:
+      containers:
+      - image: gcr.io/kubernetes-e2e-test-images/serve-hostname-amd64:1.1
+        imagePullPolicy: IfNotPresent
+        name: hostname
+      terminationGracePeriodSeconds: 120
\ No newline at end of file

test/e2e/testing-manifests/ingress/neg/svc.yaml

+apiVersion: v1
+kind: Service
+metadata:
+  name: hostname
+  annotations:
+    alpha.cloud.google.com/load-balancer-neg: "true"
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 9376
+  selector:
+    run: hostname
+  sessionAffinity: None
+  type: NodePort
\ No newline at end of file