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 am: dff57d940f  -s ours
am: 5f670877ec  -s ours

Change-Id: I5bf578eb9cb2c34d7e6aa475692ddb3d34aafda3