mock can't override sys.stdout.flush on Python 2.7, mock sys.stdout instead
The test suite currently fails on Python 2.7 and probably below due to mock failing to override sys.stdout.flush. This patch mocks sys.stdout instead.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The test suite currently fails on Python 2.7 and probably below due to mock failing to override sys.stdout.flush. This patch mocks sys.stdout instead.