huawei manila driver code refactoring

Registered by zhongjun

The Huawei manila driver code should be restructured.
Instead of using a loose interface definition of share drivers, use the ABC
python library to build abstract classes that enforces the driver to implement
the needed functionality.

The huawei_helper.py is too long, the code structure should be adjusted.

Blueprint information

Status:
Complete
Approver:
Valeriy Ponomaryov
Priority:
Low
Drafter:
zhongjun
Direction:
Approved
Assignee:
zhongjun
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon 1.0.0
Started by
zhongjun
Completed by
zhongjun

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