Refactor TestAddProjectToImage with FakeImage class
Refactor TestAddProjectToImage with FakeImage class

Change-Id: I6733601f12389eb744dbf0be64b7c556356b4730
Co-Authored-By: ting wang <083d50256b2526f1cf6aa98db7ccf35938e46a6f@outlook.com>
Implements: blueprint improve-image-unittest-framework

dtroyer/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient