Upgrade Kubectl to 1.16.15

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, hit 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:
Updated both the build and the e2e image to Kubectl 1.16.15 (same as client-go etc)

Which issue(s) this PR fixes:

Work on #1649

Special notes for your reviewer:

N/A

[aLekSer]

I wonder if a new version of Kubernetes code-generator would produce something different? I mean this line of Dockerfile was also impacted:

RUN mkdir -p /go/src/k8s.io && cd /go/src/k8s.io && \
    git clone -b kubernetes-${KUBERNETES_VER} --depth=3 https://github.com/kubernetes/code-generator.git

[markmandel]

I wonder if a new version of Kubernetes code-generator would produce something new? I mean this line of Dockerfile was also impacted:

RUN mkdir -p /go/src/k8s.io && cd /go/src/k8s.io && \
    git clone -b kubernetes-${KUBERNETES_VER} --depth=3 https://github.com/kubernetes/code-generator.git

Ooh, that's a good question. Lemme hop on that too.

[markmandel]

So I ran it - one small change in clientset.go -- I'll submit a PR once this is done (unless you want it in here?)

[agones-bot]

Build Failed 😱

Build Id: 0fb9cd9a-7996-44dd-b02c-b5087abf4e89

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[aLekSer]

I think changes to generated crd-client can go into a separate PR. Just so all devs would have no surprising diff after running make gen-crd-client.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[aLekSer]

Looking at SDK conformance tests these days. This fail is the same as before - attempting to connect when SDK server is stopped.

make[2]: *** [run-sdk-conformance-no-build] Error 1
includes/sdk.mk:145: recipe for target 'run-sdk-conformance-no-build' failed
includes/sdk.mk:152: recipe for target 'run-sdk-conformance-test' failed
make[1]: *** [run-sdk-conformance-test] Error 2
includes/sdk.mk:159: recipe for target 'run-sdk-conformance-test-node' failed
make: *** [run-sdk-conformance-test-node] Error 2
make: *** Waiting for unfinished jobs....
# run with feature flags enabled
/usr/bin/make run-sdk-conformance-no-build SDK_FOLDER=go GRPC_PORT=9001 HTTP_PORT=9101 FEATURE_GATES=PlayerTracking=true TESTS=ready,allocate,setlabel,setannotation,gameserver,health,shutdown,watch,reserve,getplayercapacity,setplayercapacity,playerconnect,playerdisconnect,getplayercount,isplayerconnected,getconnectedplayers
+ /root/sdktest.sh
+ cd /go/src/agones.dev/agones/test/sdk/nodejs
+ npm run testSDK

> @ testSDK /go/src/agones.dev/agones/test/sdk/nodejs
> node ./testSDKClient.js

attempting to connect

[agones-bot]

Build Succeeded 👏

Build Id: 93da8af6-8ba4-47d3-8953-55004e5e2a27

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

• image: gcr.io/agones-images/agones-controller:1.9.0-1a10473
• image: gcr.io/agones-images/agones-sdk:1.9.0-1a10473
• image: gcr.io/agones-images/agones-ping:1.9.0-1a10473
• Linux C++ SDK (build): agonessdk-1.9.0-1a10473-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.9.0-1a10473.zip

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

• https://1a10473-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1806/head:pr_1806 && git checkout pr_1806
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.9.0-1a10473