YARN-2074. Changed ResourceManager to not count AM preemptions towards app failures. Contributed by Jian He.
svn merge --ignore-ancestry -c 1605106 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1605107 13f79535-47bb-0310-9956-ffa450edef68
YARN-2111. In FairScheduler.attemptScheduling, we don't count containers as assigned if they have 0 memory but non-zero cores (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1605115 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6430. HTTPFS - Implement XAttr support. (Yi Liu via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1605122 13f79535-47bb-0310-9956-ffa450edef68