HDFS-3493. Invalidate excess corrupted blocks as long as minimum replication is satisfied. Contributed by Juan Yu and Vinayakumar B.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602293 13f79535-47bb-0310-9956-ffa450edef68
YARN-2155. FairScheduler: Incorrect threshold check for preemption. (Wei Yan via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602297 13f79535-47bb-0310-9956-ffa450edef68
YARN-1702. Added kill app functionality to RM web services. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1602298 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602300 13f79535-47bb-0310-9956-ffa450edef68