Delete orphaned staging directories for staged session on reboot

Bug: 173132101
Test: manually created folders in /data/app-staging and observed they were deleted on reboot
Change-Id: If840f35245c2d049401d0d2f6539fe8c4625151e
Merged-In: If840f35245c2d049401d0d2f6539fe8c4625151e
(cherry picked from commit bfbf960801)

services/core/java/com/android/server/pm/PackageInstallerService.java

@@ -287,6 +287,10 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
         final ArraySet<File> unclaimedStages = newArraySet(
                 stagingDir.listFiles(sStageFilter));
 
+        // We also need to clean up orphaned staging directory for staged sessions
+        final File stagedSessionStagingDir = Environment.getDataStagingDirectory(volumeUuid);
+        unclaimedStages.addAll(newArraySet(stagedSessionStagingDir.listFiles()));
+
         // Ignore stages claimed by active sessions
         for (int i = 0; i < mSessions.size(); i++) {
             final PackageInstallerSession session = mSessions.valueAt(i);