MAPREDUCE-5766. Moved ping messages from TaskAttempts to be at DEBUG level inside the ApplicationMaster log. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572380 13f79535-47bb-0310-9956-ffa450edef68
YARN-1301. Added the INFO level log of the non-empty blacklist additions and removals inside ApplicationMasterService. Contributed by Tsuyoshi Ozawa.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572400 13f79535-47bb-0310-9956-ffa450edef68