Merge "Specify --max_timestamp when calling brillo_update_payload." into nyc-dev am: 258f04a556  -s ours am: 478e5c3ff4  -s ours am: 2b7db24048  -s ours am: 289910cb63  -s ours am: 52eb6cbd46  -s ours am: 2d9cfe30f8  -s ours
am: 614eece356  -s ours

Change-Id: Ibdac8e0e136de0ccdf5f8a1e435211ea35c82c84