Huanxuan Ao 677dfaa925 Fix unit test for volume commands in volumev2
There are some issues in test_volume.py in volumev2,
I make three changes in this patch:

1.modified some codes that not used FakeVolume class.
2.added a fake image by FakeImage class for this test.
3.added a fake snapshot by FakeSnapshot class for this test.

Change-Id: I02ba73d3aaee95624b0e2307b255e0e485b0c3a3
2016-05-31 17:36:02 +08:00
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2016-05-28 16:38:22 +08:00
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