move HADOOP-9806,HDFS-5043,HDFS-4962 to the right section in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510675 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4366. Block Replication Policy Implementation May Skip Higher-Priority Blocks for Lower-Priority Blocks. Contributed by Derek Dagit.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510724 13f79535-47bb-0310-9956-ffa450edef68
Fix CHANGES.txt. Move HDFS-4366 from 2.3.0 to under 3.0.0.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510727 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9319. Update bundled LZ4 source to r99. (Binglin Chang via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510734 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9816. RPC Sasl QOP is broken (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510772 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4905. Add appendToFile command to "hdfs dfs". Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510773 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9832. Add RPC header to client ping (daryn)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510793 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-Y-12345-trunk-gd