Improve image unittest framework of the OSC
The current unittest framework about image mainly has two drawbacks, hardcode for the faking image and only one faking image can be faked. So, this BP attempts to improve this test framework with two steps:
1. add FakeImage, and then with it user can generate more than faking image and all image info is generated by random.
2. add multi-image testcases (e.g. TestImageDelete) and refactor the legacy unit tests about image with new framework.
Whiteboard
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Introduce FakeImage class
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Use FakeImage in server test cases.
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Add "properties" into FakeImage class
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Refactor TestImageDelete with FakeImage
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Add multi deletion testcase for "openstack image delete"
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Refactor TestImageCreate with FakeImage class
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Refactor TestAddProjectT
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Refactor TestImageList with FakeImage class
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Refactor TestRemoveProje
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Refactor TestAddProjectT
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Refactor TestImageList with FakeImage class
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Refactor TestRemoveProje
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Refactor image v1 unit tests with FakeImage class
