Add a way to record causePackages for rollbacks.

By passing a new causePackages list of VersionedPackage to
commitRollback and adding a RollbackInfo.getCausePackages() method to
retrieve the cause packages for committed rollbacks.

Bug: 112431924
Test: atest RollbackTest
Change-Id: I3b52511fd7e31b6304e7a7c34180dbb4d20f6dbf
9 files changed