Disable Auto Upgrade for Deployment Manager

[aLekSer]

Create development clusters with auto-upgrade disabled.

Part of #1137.
Relates to #1141.

[agones-bot]

Build Succeeded 👏

Build Id: a959ca5d-a855-45cf-b91c-d9ea946aa342

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

• image: gcr.io/agones-images/agones-controller:1.1.0-78279eb
• image: gcr.io/agones-images/agones-sdk:1.1.0-78279eb
• image: gcr.io/agones-images/agones-ping:1.1.0-78279eb
• Linux C++ SDK (build): agonessdk-1.1.0-78279eb-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.1.0-78279eb.zip

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

• https://78279eb-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1143/head:pr_1143 && git checkout pr_1143
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.1.0-78279eb

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[roberthbailey]

This is part of #1137.