HDFS-4996. Merging change r1504679 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504682 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9164. Print paths of loaded native libraries in NativeLibraryChecker. (Binglin Chang via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504706 13f79535-47bb-0310-9956-ffa450edef68
YARN-814. Improving diagnostics when containers fail during launch due to various reasons like invalid env etc. Contributed by Jian He.
svn merge --ignore-ancestry -c 1504732 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504733 13f79535-47bb-0310-9956-ffa450edef68
Merge -c 1504735 from trunk to branch-2 to fix YARN-918. Remove ApplicationAttemptId from RegisterApplicationMasterRequestProto. Contributed by Vinod K V.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504736 13f79535-47bb-0310-9956-ffa450edef68
Fixed CHANGES.txt to reflect that all fixes in 2.1.1-beta are now in 2.1.0-beta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504739 13f79535-47bb-0310-9956-ffa450edef68