When running the tests with concurrency=1, 2 tests fail with:
AttributeError: Mock object has no attribute 'debug'
and
AssertionError: Expected 'notify' to be called once. Called 0 times
Mocking the LOG object solves the problem.
Change-Id: Ie7f4448a103fae448123a05bc92e961aac00d6ec
Closes-Bug: #1660393