add filter support to get-pools

Registered by Cao ShuFeng on 2016-05-21

Now cinder get-pools can show all backends' info.
We can add a filter like "--name" to show info of a specified backend pool.

Blueprint information

Status:
Not started
Approver:
Sean McGinnis
Priority:
Low
Drafter:
Cao ShuFeng
Direction:
Approved
Assignee:
Cao ShuFeng
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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