Kind test script Istio install failing with kubectl version v1.18.x

[glindsell]

testing/scripts/kind_test_setup.sh fails with following errors due to CRD not being present:

unable to recognize "istio-1.4.2.yaml": no matches for kind "Gateway" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "VirtualService" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "EnvoyFilter" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "DestinationRule" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "Policy" in version "authentication.istio.io/v1alpha1"
unable to recognize "istio-1.4.2.yaml": no matches for kind "Gateway" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "Sidecar" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "MeshPolicy" in version "authentication.istio.io/v1alpha1"
unable to recognize "istio-1.4.2.yaml": no matches for kind "DestinationRule" in version "networking.istio.io/v1alpha3"
unable to recognize "istio-1.4.2.yaml": no matches for kind "attributemanifest" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "attributemanifest" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "handler" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "handler" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "handler" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "rule" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "instance" in version "config.istio.io/v1alpha2"
unable to recognize "istio-1.4.2.yaml": no matches for kind "DestinationRule" in version "networking.istio.io/v1alpha3"

This has only been found to happen when using the following version of kubectl client:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-21T01:25:41Z", GoVersion:"go1.13.10", Compiler:"gc", Platform:"linux/amd64"}

Versions v1.17.x and v1.16.x of kubectl client do not fail.

Additionally if using v1.18.x, if the CRDs are installed separately as shown here before Istio is installed, then the errors do not occur.

[glindsell]

Related issues:
kubernetes-sigs/kind#762
istio/istio#11409
knative/serving#2195

[glindsell]

#1808 pins the test scripts to kubectl v1.17.0
Replaced by #1810

[glindsell]

Fixed by #1810