Load rollback data in RollbackManagerServiceImpl constructor.

Load the rollback data from persistent storage in the
RollbackManagerServiceImpl constructor instead of lazily. This way we
don't have to remember to ensureRollbackDataLoaded every time we access
the rollback data. In the vast majority of cases we expect there to be
no data to load, so this shouldn't impact boot time.

Change reloadPeristentData to block until the data has been reloaded.

Consistently throw IllegalStateException in case of
InterruptedException. There shouldn't be anyone calling
Thread.interrupt() on the RollbackManagerHandlerThread. If it turns out
someone does call Thread.interrupt() on the
RollbackManagerHandlerThread, throwing IllegalStateException instead of
ignoring the exception will help debug; then we can update the logic for
handling InterruptedException in whatever way makes most sense.

Test: atest RollbackTest
Bug: 136241838
Change-Id: I9dc51268db39b9ba29aedbcbd09ab9111b294a7b
Merged-In: Ia5e73b0786b93064f8f80138d3e162b9613f2d55