dingd fb114ed943 [Unity] Support create volume with tiering policy.
four supported values:
  - ``StartHighThenAuto``(default)
  - ``Auto``
  - ``HighestAvailable``
  - ``LowestAvailable``

Change-Id: I571cec8139b645f0899428ccd4479a2e11bb92d6
2020-03-31 02:33:17 +00:00
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