Huanxuan Ao 4bea5d37d9 Fix errors for "volume type unset" command
Normally, we can unset multi properties but the "volume type unset"
command could not, because the action "append" was missed. So I add
it and also fix the unit test and doc in this patch.

Change-Id: I20470f2b7bb2a8d7f292cea498826669c3418c77
2016-06-06 19:04:36 +08:00
..
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2016-05-31 16:13:16 +08:00