YARN-1707. Introduce APIs to add/remove/resize queues in the
CapacityScheduler. (Carlo Curino and Subru Krishnan via curino)

YARN-2475. Logic for responding to capacity drops for the 
ReservationSystem. (Carlo Curino and Subru Krishnan via curino)

YARN-1708. Public YARN APIs for creating/updating/deleting reservations. (subru)