add command to get supported server versions

Registered by Scott DAngelo

In Mitaka, the Cinder API added the ability to get the SUPPORTED and highest CURRENT server versions. This Blueprint is to add a command in cinderclient to get that info:
cinder get-server-versions

Blueprint information

Status:
Not started
Approver:
Sean McGinnis
Priority:
High
Drafter:
Scott DAngelo
Direction:
Approved
Assignee:
Scott DAngelo
Definition:
Approved
Series goal:
Accepted for newton
Implementation:
Unknown
Milestone target:
None

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