merge r1512026: HADOOP-9833 move slf4j to version 1.7.5

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512048 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1512057 merging from trunk to branch-2 to fix HDFS-5047. Supress logging of full stack trace of quota and lease exceptions.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512058 13f79535-47bb-0310-9956-ffa450edef68
Merge -c 1512081 from trunk to branch-2 to fix YARN-1043. Push all metrics consistently. Contributed by Jian He.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512082 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-253-branch-2-gd