Adding support for reporting disk type of pool in huawei manila
driver. When creating share we can specify the disk type of the
pool we want to use ssd/sas/nl_sas/mix, manila driver will report
the disk type of the pools.
Implements: blueprint huawei-pool-disktype-support
Change-Id: I1f694e8c93f79851f838d226830d9ab5344cf35a