added fleet-distributed.yaml for use in load testing

usage:

```
$ kubectl create -f examples/simple-udp/fleet-distributed.yaml
$ kubectl scale fleet simple-udp-distributed --replicas=1000
```

examples/simple-udp/fleet-distributed.yaml

@@ -0,0 +1,42 @@
+# Copyright 2019 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# special fleet for load testing where we scale the fleet up/and down
+# it uses artificially low resource requests to be able to put as many
+# pods on a node as possible.
+
+apiVersion: "stable.agones.dev/v1alpha1"
+kind: Fleet
+metadata:
+  name: simple-udp-distributed
+spec:
+  replicas: 0
+  scheduling: Distributed
+  template:
+    spec:
+      ports:
+      - name: default
+        containerPort: 7654
+      template:
+        spec:
+          containers:
+          - name: simple-udp
+            image: gcr.io/agones-images/udp-server:0.6
+            resources:
+              requests:
+                memory: "32Mi"
+                cpu: "20m"
+              limits:
+                memory: "32Mi"
+                cpu: "20m"