[20180415180827] Throttling Fixes, Faster Default Builds, and Bug Fixes

[ddollar]

• #2597 custom manifest support [@ddollar]
• #2599 hash listener rule priority based on app, service, domain [@ddollar]
• #2600 remove converging status to avoid ecs throttling [@ddollar]
• #2602 change default builder params [@ddollar]