Move HDFS-5538, HDFS-5545, HDFS-5536, HDFS-5312, and HDFS-5629 from trunk to 2.4.0 section.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1551724 13f79535-47bb-0310-9956-ffa450edef68