support volume revert to any snapshot

Registered by Xiaojun Liao on 2017-10-27

For some volume backend drivers such as ceph can revert to any snasphot depending on backend drivers, cinder API can cancel the most-recent -snapshot limit, manager will give a error state if reverting-to-non-latest-snapshot is not supported by backend driver.

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Drafter:
Xiaojun Liao
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Needs approval
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Definition:
New
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Unknown
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