[automerger skipped] Allow staging multiple sessions with non-overlapping...

[automerger skipped] Allow staging multiple sessions with non-overlapping packages (apk+apex) am: ca438ddb am: 3793c428 -s ours am: 71cc803c -s ours am: ad6e53d8 -s ours am: 53722cd0 -s ours

am skip reason: Change-Id Ic7fbdddf30047cafb712a102556b70c6dab271b1 with SHA-1 da4eeabf is in history

Change-Id: Ica7f0c1225cf43f7abcbf497591a1cc6dfd5d254