Huanxuan Ao 95f0e3dc36 Fix errors in volume set/unset image properties unit tests
These errors may caused by copy-paste, we should specify
a fake return value for get() method but not create() method.
Create() mothod will not called in set/unset command. After
specifing the return value of get(), we can use the fake volume
in the assert.

Change-Id: I1e0df4c28ece373168788c396e9082d565e36cc7
2016-08-11 11:43:03 +08:00
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