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

Change-Id: Ibdac8e0e136de0ccdf5f8a1e435211ea35c82c84