Add HUAWEI volume driver in Cinder

This is an iSCSI driver.It supports HUAWEI OceanStor T and
Dorado series storage systems.The driver communicates with
storage systems based on SSH.

Implements: blueprint huawei-volume-driver
Change-Id: Ib3fd8ff636106e751789f6367a5b57bdaab316f4
Merge "Add HUAWEI volume driver in Cinder"