Replace the usage of RollbackTestUtils with the API offered by
com.android.cts.install.lib and com.android.cts.rollback.lib.
Test: atest RollbackTest
Test: atest StagedRollbackTest #testBadApkOnly
Bug: 132757394
Bug: 132422403
Change-Id: I25cb9dca103852d7ee3691e4df927e1fc5848074