Move HADOP-7101 from 0.22 section to 0.23

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1455948 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4593. TestSaveNamespace fails on Windows. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1455956 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4595. When short circuit read is fails, DFSClient does not fallback to regular reads. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1456047 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd