[molecule] skip the OpenShift part of the test if not on OpenShift

[jmazzitelli]

I tested on both minikube and openshift and all works now - molecule test now passes for both:

Minikube

./hack/k8s-minikube.sh start

./hack/k8s-minikube.sh istio 

./hack/run-molecule-tests.sh --client-exe "$(which kubectl)" -dorp podman --cluster-type minikube -at "remote-cluster-resources-test"

OpenShift

./hack/crc-openshift.sh start -p <path to your pull-secret.txt>

oc login -u kubeadmin -p kiali https://api.crc.testing:6443 --insecure-skip-tls-verify

./hack/istio/install-istio-via-istioctl.sh -cp openshift

./hack/run-molecule-tests.sh --client-exe "$(which oc)" -dorp podman --cluster-type openshift -at "remote-cluster-resources-test"

[jshaughn]

makes sense to me