Update the volume's available_zone after changed its backend's available_zone

Registered by Brin Zhang

In the scenario of many of our cloud customers, they are always need to add (or change) a volume backend for the OpenStack cluster, with this scenario, we should change the volume's available_zone if it's backend's available_zone changed.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Brin Zhang
Direction:
Needs approval
Assignee:
xuanyandong
Definition:
Drafting
Series goal:
Proposed for xena
Implementation:
Unknown
Milestone target:
None

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