Add logs for debugging

See b/151890602#comment4.

If the assumption is true, we will see logs that the rollback for
testappA is exipred happens slightly after the call to #getAvailableRollbacks.

Also move assertions below so the test runs to the end and we have a
better picture for what happened during the test.

Bug: 151890602
Test: m
Change-Id: I85adb8c3c5598ef4ce11550b51f22d1ce3c282a6