HADOOP-10474. Merge r1585886 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1585887 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10475. Merge change r1585888 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1585889 13f79535-47bb-0310-9956-ffa450edef68
YARN-1784. TestContainerAllocation assumes CapacityScheduler. (Robert Kanter via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1585895 13f79535-47bb-0310-9956-ffa450edef68