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

Change-Id: I17f29cb5fde8191af48786ab6500bb473fdd4882