Adjusting test sleeps. Test exceeding 30s duration limit, no need to wait that much. Increasing buffer to reduce flakiness. Bug:297829298 Change-Id: I3ad160e5f965b4964a7b72f0c9a1d4e68a8e2574 Test:atest --rerun-until-failure 10 CtsRollbackManagerTestCases:com.android.cts.rollback.RollbackManagerTest-- --abi x86_64