Update terraform configs to use Kubernetes 1.13

[roberthbailey]

Part of #1044

/hold

Adding a hold until #1167 is merged.

/assign @aLekSer

[agones-bot]

Build Failed 😱

Build Id: 6e3739a9-28cc-418c-b77b-3a6ec2e56e81

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[roberthbailey]

--- FAIL: TestGameServerRestartBeforeReadyCrash (268.32s)
    gameserver_test.go:304: 
        	Error Trace:	gameserver_test.go:304
        	Error:      	Could not make GameServer Ready: %v
        	Test:       	TestGameServerRestartBeforeReadyCrash
        	Messages:   	timed out waiting for the condition
FAIL

This is #1173.

[aLekSer]

PR looks good, I will verify this with E2E tests once #1167 would be merged.

[markmandel]

If @aLekSer says it's good, I believe him 😄

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 1960a34e-6443-4e4f-8596-ce47356a89e8

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

• image: gcr.io/agones-images/agones-controller:1.2.0-56499cd
• image: gcr.io/agones-images/agones-sdk:1.2.0-56499cd
• image: gcr.io/agones-images/agones-ping:1.2.0-56499cd
• Linux C++ SDK (build): agonessdk-1.2.0-56499cd-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.2.0-56499cd.zip

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

• https://56499cd-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1179/head:pr_1179 && git checkout pr_1179
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.2.0-56499cd

[roberthbailey]

@aLekSer and I were waiting on #1167 to merge first as I was hoping to save @amitlevy21 from having to rebase.

[markmandel]

Doh! I didn't see the hold!