Update add delete update member tests

*Updated add_image_member test
- Replaced ComputeIntegrationFixture with ImagesFixture
- Updated tests due to behavior, fixture and config changes
*Updated delete_image_member test
- Replaced ComputeIntegrationFixture with ImagesFixture
- Updated tests due to behavior, fixture and config changes
- Added setup class for image creation
*Updated update_image_member test
- Replaced ComputeIntegrationFixture with ImagesFixture
- Updated tests due to behavior, fixture and config changes
- Added setup class for image creation

Change-Id: I680538de3cb83e411fe763abf7cfb9365ee4fc74
Merge "Update add delete update member tests"