Fix update Huawei driver issue

Fix update Huawei driver issue

If a volume is created with old version of Huawei driver,
there is no pool info related to the volume, but the new
version of Huawei driver assumes that the volume have the
pool info and will read the pool info from the volume,
and then the read fails. This will happen when we call
create_volume_from_snapshot() in new version of Huawei
driver when the volume is created by old version of Huawei
driver.

Closes-bug: #1499251
Change-Id: I296f6354340e1a3698d8a284c9aa2a444c73771d