Fixed autofill's UiBot.assertNoDatasets()

Also fixed RetryRule so it doesn't retry on StaleObjectException, as this
exception is most likely thrown due to an error in the test case logic.

Test: atest CtsAutoFillServiceTestCases
Fixes: 73064230

Change-Id: I0882d36bd058a3b6fa9b2b0911d486e8b91acd4c
4 files changed