Refactor CRD to support K8s 1.15 specific requirements

[carsonoid]

K8s 1.15 added extra validation to CRD structure when using
the v1beta1 api. The CRD has been restructured to conform
to the new rules.

I also moved the test to the v1beta1 api client.

Signed-off-by: Carson Anderson ca@carsonoid.net

---

I have manually validated that the crd below works for K8s 1.13, 1.14, 1.15 and 1.16:

This was the validation script:

k3d create --name=113 --port=6113 --version=v0.3.0
k3d create --name=114 --port=6114 --version=v0.8.1
k3d create --name=115 --port=6115 --version=v0.9.0-rc1
k3d create --name=116 --port=6116

for v in 113 114 115 116; do
    echo
    echo testing $v
    export KUBECONFIG="$(k3d get-kubeconfig --name=$v)"
    kubectl version
    kubectl apply -f helm/vitess/crds/VitessTopoNodes-crd.yaml
done

k3d delete --name=113
k3d delete --name=114
k3d delete --name=115
k3d delete --name=116

Results:

testing 113
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.5", GitCommit:"20c265fef0741dd71a66480e35bd69f18351daea", GitTreeState:"clean", BuildDate:"2019-10-15T19:16:51Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5-k3s.1", GitCommit:"256ea73aeb2627eb9b510f6c22881af8f967dd0c", GitTreeState:"clean", BuildDate:"2019-03-27T18:49+00:00Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
customresourcedefinition.apiextensions.k8s.io/vitesstoponodes.topo.vitess.io created

testing 114
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.5", GitCommit:"20c265fef0741dd71a66480e35bd69f18351daea", GitTreeState:"clean", BuildDate:"2019-10-15T19:16:51Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.6-k3s.1", GitCommit:"4cd85f14854d942e9016cc15f399785c103242e9", GitTreeState:"clean", BuildDate:"2019-08-19T16:12+00:00Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
customresourcedefinition.apiextensions.k8s.io/vitesstoponodes.topo.vitess.io created

testing 115
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.5", GitCommit:"20c265fef0741dd71a66480e35bd69f18351daea", GitTreeState:"clean", BuildDate:"2019-10-15T19:16:51Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.3-k3s.1", GitCommit:"2258cf7b7c767ecca887c5fc17784b3f8472b271", GitTreeState:"clean", BuildDate:"2019-08-29T05:27+00:00Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
customresourcedefinition.apiextensions.k8s.io/vitesstoponodes.topo.vitess.io created

testing 116
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.5", GitCommit:"20c265fef0741dd71a66480e35bd69f18351daea", GitTreeState:"clean", BuildDate:"2019-10-15T19:16:51Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.2-k3s.1", GitCommit:"b8b17ba55f20e590df507fce333dfee13ab438c6", GitTreeState:"clean", BuildDate:"2019-10-16T05:17Z", GoVersion:"go1.13.3", Compiler:"gc", Platform:"linux/amd64"}
customresourcedefinition.apiextensions.k8s.io/vitesstoponodes.topo.vitess.io created

[morgo]

Manually tested on 1.15, LGTM

[morgo]

The failing test will be fixed in #6076

I'm going to merge this.