Terraform fix AKS Node Pool Labels

[aLekSer]

Now Agones controllers are deployed in Agones System node pool.

Closes #1383 .

Now Agones controller is scheduled to the right node:
aks-system-55978144-vmss000000/10.240.0.6

kubectl describe pod agones-controller-fb6798699-cb87l --namespace agones-system                                                                                      
Name:                 agones-controller-fb6798699-cb87l
Namespace:            agones-system
Priority:             1000000
Priority Class Name:  agones-system
Node:                 aks-system-55978144-vmss000000/10.240.0.6
Start Time:           Thu, 19 Mar 2020 18:57:00 +0300
Labels:               agones.dev/role=controller
                      app=agones
                      heritage=Tiller
                      pod-template-hash=fb6798699
                      release=agones                                                                                                                                                                     
Annotations:          cluster-autoscaler.kubernetes.io/safe-to-evict: false                                                                                                                              
                      prometheus.io/path: /metrics                                                                                                                                                       
                      prometheus.io/port: 8080                                                                                                                                                           
                      prometheus.io/scrape: true                                                                                                                                                         
                      revision/tls-cert: 1

[agones-bot]

Build Succeeded 👏

Build Id: ef4cf1f7-429e-42ed-b9e1-50ad272cbe0a

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.5.0-0f23a6e
• image: gcr.io/agones-images/agones-sdk:1.5.0-0f23a6e
• image: gcr.io/agones-images/agones-ping:1.5.0-0f23a6e
• Linux C++ SDK (build): agonessdk-1.5.0-0f23a6e-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.5.0-0f23a6e.zip

A preview of the website (the last 30 builds are retained):

• https://0f23a6e-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1420/head:pr_1420 && git checkout pr_1420
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.5.0-0f23a6e

[markmandel]

Looks good to me!

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aLekSer, markmandel

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