Wait for the shutdown signal before having the simple game server exit

[roberthbailey]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:

I tested both scenarios: connecting with nc and sending the EXIT command and using the automaticShutdownDelaySec flag on the fleet and in both cases the game server exits as expected.

[agones-bot]

Build Failed 😱

Build Id: 1553eaef-8b2f-4940-aade-ce36345388af

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[roberthbailey]

sdk-conformance failed:

make[2]: *** [includes/sdk.mk:145: run-sdk-conformance-no-build] Error 1
make[1]: *** [includes/sdk.mk:153: run-sdk-conformance-test] Error 2
make: *** [includes/sdk.mk:156: run-sdk-conformance-test-cpp] Error 2
make: *** Waiting for unfinished jobs....
Shutting down after 10 seconds...
Could not run Shutdown():Connect Failed. Exiting!
terminate called without an active exception
/root/sdktest.sh: line 18:     9 Aborted                 (core dumped) /go/src/agones.dev/agones/test/sdk/cpp/.build/.bin/cpp-simple
make[3]: *** [includes/sdk.mk:88: run-sdk-command] Error 134
{"message":"shutting down sdk server","severity":"info","source":"main","time":"2022-02-02T00:30:40.952275177Z"}
{"message":"Received requests match expected list. Test run was successful","sdkName":"go","severity":"info","source":"*sdkserver.LocalSDKServer","time":"2022-02-02T00:30:40.952424952Z"}
{"error":"http: Server closed","message":"http server closed","severity":"info","source":"main","time":"2022-02-02T00:30:40.952643993Z"}

[agones-bot]

Build Succeeded 👏

Build Id: fdd40fd5-aa66-427b-9b85-5cc8d3be104e

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

• image: gcr.io/agones-images/agones-controller:1.21.0-8e71787
• image: gcr.io/agones-images/agones-ping:1.21.0-8e71787
• Linux C++ SDK (build): agonessdk-1.21.0-8e71787-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.21.0-8e71787.zip

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

• https://8e71787-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2463/head:pr_2463 && git checkout pr_2463
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.21.0-8e71787

[ilkercelikyilmaz]

LGTM

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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