Restoring of apps that rotated key wouldn't be possible due to
explicit signature matching.
Amend signature matching strategies to take into account
apps that have rotated key.
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/backup/utils/AppBackupUtilsTest.java
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/pm/backup/BackupUtilsTest.java
Test: m -j RunFrameworksServicesRoboTests
Test: runtest -p com.android.server.backup frameworks-services
Bug: 64686581
Bug: 34345052
Change-Id: I91b5ae0afb6f2714ceae02b4d4dc202d6cd4fe4e