contrib/kube-prometheus: Update custom-metrics example to use our adapter

...etrics-apiserver-auth-delegator-cluster-role-binding.yaml

...pi/custom-metrics-apiserver-auth-reader-role-binding.yaml

...stom-metrics-api/custom-metrics-apiserver-deployment.yaml

...trics-apiserver-resource-reader-cluster-role-binding.yaml

...metrics-api/custom-metrics-apiserver-service-account.yaml

.../custom-metrics-api/custom-metrics-apiserver-service.yaml

...imental/custom-metrics-api/custom-metrics-apiservice.yaml

...rimental/custom-metrics-api/custom-metrics-configmap.yaml

...rics-api/custom-metrics-resource-reader-cluster-role.yaml

experimental/custom-metrics-api/deploy.sh

experimental/custom-metrics-api/gencerts.sh

experimental/custom-metrics-api/teardown.sh