Make all yaml files in the examples directory use working configurations / images

[roberthbailey]

Files to verify / update:

• fleet.yaml
• fleetautoscaler.yaml
• gameserver.yaml
• gameserverallocation.yaml
• webhookfleetautoscaler.yaml
• webhookfleetautoscalertls.yaml

We also need to update https://agones.dev/site/docs/examples/ for the 0.12 release to remove the working about the examples not being functional.

[roberthbailey]

webhookfleetautoscaler.yaml and webhookfleetautoscalertls.yaml are used in https://agones.dev/site/docs/getting-started/create-webhook-fleetautoscaler/ which I've gone through recently so those ones should be fine.

[roberthbailey]

The fleet.yaml file appears to be ok already:

$ kubectl apply -f https://raw.githubusercontent.com/googleforgames/agones/master/examples/fleet.yaml
fleet.agones.dev/fleet-example created
$ kubectl get gs
NAME                        STATE   ADDRESS          PORT   NODE                                     AGE
fleet-example-shz66-bmqx5   Ready   104.196.251.83   7427   gke-test-cluster-default-07171326-f5n8   8s
fleet-example-shz66-lpcdw   Ready   104.196.251.83   7087   gke-test-cluster-default-07171326-f5n8   8s

[roberthbailey]

Likewise, fleetautoscaler.yaml appears fine too.

[roberthbailey]

@aLekSer has a PR to fix gameserver.yaml, which just leaves gameserverallocation.yaml and the website update.

[roberthbailey]

We may also want to update the website's pages under Reference to include any updates to the files. Right now most of them inline a yaml and link to the examples folder, but it would be nice if the inlined yaml matched what was in the examples folder.

[aLekSer]

gameserverallocation.yaml is fine.
In order to use it we need next fleet.yaml configuration:

apiVersion: "agones.dev/v1"
kind: Fleet
metadata:
  name: green-fleet
spec:
  replicas: 2
  template:
    metadata:
      labels:
        game: my-game
        tier: cache
    spec:
      ports:
      - name: default
        containerPort: 7654
      template:
        spec:
          containers:
          - name: simple-udp
            image: gcr.io/agones-images/udp-server:0.14