Merge "Specify --max_timestamp when calling brillo_update_payload." into...

Merge "Specify --max_timestamp when calling brillo_update_payload." into nyc-dev am: 258f04a5  -s ours am: 478e5c3f  -s ours am: 2b7db240  -s ours am: 289910cb  -s ours am: 52eb6cbd  -s ours am: 2d9cfe30  -s ours am: 614eece3  -s ours am: dff57d94  -s ours
am: 5f670877  -s ours

Change-Id: I5bf578eb9cb2c34d7e6aa475692ddb3d34aafda3