YARN-2022 Preempting an Application Master container can be kept as least priority when multiple applications are marked for preemption by ProportionalCapacityPreemptionPolicy (Sunil G via mayank)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607227 13f79535-47bb-0310-9956-ffa450edef68
YARN-2204. Explicitly enable vmem check in TestContainersMonitor#testContainerKillOnMemoryOverflow. (Anubhav Dhoot via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607231 13f79535-47bb-0310-9956-ffa450edef68