e2e: update external-snapshotter version to v3.0.1
e2e: update external-snapshotter version to v3.0.1

For external-snapshotter v3.0.1,
Supported CSI Spec Versions: 1.0.0, 1.1.0, 1.2.0
Minimum Kubernetes version: 1.17
Recommended Kubernetes version: 1.17

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi