e2e tests

1. Deploy a Kubernetes cluster on Apache CloudStack;

2. Deploy the cloudstack-csi-driver;

3. Set environment variables:

   Name	Description	Required / Default behaviour
   DISK_OFFERING_ID	ID of the CloudStack disk offering to be used in e2e tests. Must accept custom sizes.	REQUIRED
   KUBECONFIG	Path to your kubeconfig file	Optional - Defaults to ${HOME}/.kube/config
   KUBE_SSH_USER	Username to use to connect to cluster nodes via SSH	Optional - Defaults to ${USER}.
   KUBE_SSH_KEY	Path of the SSH key to use to connect to cluster nodes via SSH - may be absolute or relative to ~/.ssh	Optional - Defaults to id_rsa
   KUBE_SSH_BASTION	Address (host:port) of a bastion host to use to connect to cluster nodes via SSH	Optional - Direct connection if not set

4. From the root of this repository, execute tests with:

   make test-e2e