mv_machine_learning: update test case for face recognition
[Version] : 0.28.18
[Issue type] : update test case
Update the test case 'RemoveAllLabelShouldBeOk' for face recognition.
The test case checks if unregistering all labels works well after training.
However, we didn't consider confirming the actual results
after the training-after-unregistering test.
This patch ensures that the actual results are confirmed.
Change-Id: I368a0440140d39bb3769a0a447c6cde96fb20b7b
Signed-off-by: Inki Dae <inki.dae@samsung.com>