YARN-578. Fixed NM to use SecureIOUtils for reading and aggregating logs. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1487672 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487686 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9574. Added new methods in AbstractDelegationTokenSecretManager for helping YARN ResourceManager to reuse code for RM restart. Contributed by Jian He.
svn merge --ignore-ancestry -c 1487692 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487693 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5263. Bring back old methods and fields in filecache.DistributedCache for binary compatibility with mapred in 1.x. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1487695 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487696 13f79535-47bb-0310-9956-ffa450edef68
YARN-714. Added NMTokens to be sent to AMs as part of heart-beat response. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1487704 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487705 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YAHOO-214-branch-2-gd