zhiyong.dai 55195cec46 Add "volume host failover" command
Add "volume host failover" command in volume v2 (v2 only).

Change-Id: Ia39e6d20bf5c9d3096e46f3432804a240827548d
Implements: bp cinder-command-support
2016-11-21 22:56:41 +08:00
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