feat: allow migration of RBD snapshots

This MR introduces:

• migration of RBD snapshots (underlying data)

ci/ceph-rbd-image-copy.sh

@@ -20,6 +20,8 @@ test -n "${OSTACK_SRC_VOLUME_ID}"
 test -n "${CEPH_DST_POOL}"
 test -n "${CEPH_DST_RBD_IMAGE_NAME}"
 
+test "$#" == "4"
+
 SRC_RBD_IMAGE="$(rbd --conf="${CEPH_CONFIG}" --name "${CEPH_USER}" --keyring=${CEPH_KEYRING} ls ${CEPH_SRC_POOL} | grep -E "^(volume.)?${OSTACK_SRC_VOLUME_ID}$")"
 
 rbd --conf="${CEPH_CONFIG}" --name "${CEPH_USER}" --keyring=${CEPH_KEYRING} cp ${CEPH_SRC_POOL}/${SRC_RBD_IMAGE} ${CEPH_DST_POOL}/${CEPH_DST_RBD_IMAGE_NAME}