rbd: clean images and pools in tests
rbd: clean images and pools in tests

noahdesu/go-ceph,ceph/go-ceph,AcalephStorage/go-ceph,webfd/go-ceph,AcalephStorage/go-ceph,ceph/go-ceph,theanalyst/go-ceph,ceph/go-ceph,theanalyst/go-ceph,webfd/go-ceph,noahdesu/go-ceph