In addition, domain_get() call checks previously succeeded somehow
with mox test, but they now fails after mock migration.
api.keystone.get_effective_domain_id() is now mocked instead of
api.keystone.domain_get(). There is no need to test the internal of
api.keystone, so get_effective_domain_id() is the right place to mock.
blueprint mock-framework-in-unit-tests
Change-Id: I567168a8001875efb3e768aa732ceb562b1dd99f
0a149af36b