Preparing for release 0.23.7

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467070 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1467072 FIXES: HADOOP-9222. Cover package with org.apache.hadoop.io.lz4 unit tests. Contributed by Vadim Bondarev


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467075 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4981. Add WordMean, WordMedian, WordStandardDeviation to ExamplesDriver. Contributed by Plamen Jeliazkov.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467078 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1467090 FIXES: HADOOP-9233. Cover package org.apache.hadoop.io.compress.zlib with unit tests. Contributed by Vadim Bondarev


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467099 13f79535-47bb-0310-9956-ffa450edef68
YARN-319. Submitting a job to a fair scheduler queue for which the user does not have permission causes the client to wait forever. Contributed by Shenhong.
svn merge --ignore-ancestry -c 1437336 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467110 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5059. Change average merge time on Job overview page to be the time delta between the end of the shuffle and the start of the reduce. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1467120 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467122 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5094. Disabled memory monitoring by default in MiniMRYarnCluster to avoid some downstream tests failing. Contributed by Siddharth Seth.
svn merge --ignore-ancestry -c 1467124 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1467126 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd