Tang Chen 91fbb0e136 Enable "openstack server unlock" command to take multiple servers.
Current "openstack server unlock" command could only unlock one server.
Improve it to be able to handle more than one servers. Also improve the
doc to reflect the new feature.

Change-Id: Ibf57b2021a504da950a491d63139a438087aed0b
Implements: blueprint cmd-with-multi-servers
2015-11-13 11:02:01 +08:00
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