Fix TF unit tests

- After Mockito upgrade, change of behavior concerning
expected args type and 'null'. Null is no longer matched
for any object.
- Ensure StubTest throw the expected exception in
CommandRunner and avoid changing the global config
scheduler.

Test: local unit tests in loop
Bug: 36139570
Change-Id: Ice83663e6487f691738d2741bf69fa02c51378e1
9 files changed