Test rollback not triggered when crashing under the threshold (2/n)

Move some code to testBadApkOnly_Phase2 so we also test rollback is not
triggered when we don't crash enough times.

Bug: 143052400
Test: atest StagedRollbackTest
Change-Id: If1e3fbbdc24e7e5e2c25c28a4c6b3b1980ac01fd
1 file changed