Kubernetes external storage e2e test suite

The files in this directory are used by the k8s-e2e-external-storage CI job. This job runs the Kubernetes end-to-end external storage tests with different driver configurations/manifests (in the driver-*.yaml files). Each driver configuration refers to a StorageClass that is used while testing. The StorageClasses are created with the create-storageclass.sh script and the sc-*.yaml.in templates.