optimize available-zone-list api

Registered by ZhangNi

Currently cinder available-zone-list API present available zone of all cinder volume Whether it‘s state is up, and not present the capacity data of this zone.
So we want to optimize this api,
1) Just present the available zone of cinder volume which is online and up.
2) Present the total and free capacity of these available zone.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
ZhangNi
Direction:
Needs approval
Assignee:
ZhangNi
Definition:
Obsolete
Series goal:
None
Implementation:
Good progress
Milestone target:
None
Started by
ZhangNi
Completed by
Sean McGinnis

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(smcginnis): Marking obsolete as this has been sitting out there for a long time. If this is still needed, please submit a new bp.

Thingee: need a spec before targeting.

(?)

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