HDFS-7300.     HDFS-7300. The getMaxNodesPerRack() method in
BlockPlacementPolicyDefault is flawed. contributed by Kihwal Lee
(cherry picked from commit 3ae84e1ba8928879b3eda90e79667ba5a45d60f8)
HDFS-7305. NPE seen in wbhdfs FS while running SLive. Contributed by Jing Zhao.
HADOOP-11247. Fix a couple javac warnings in NFS. Contributed by Brandon Li.
HADOOP-11216. Improve Openssl library finding. (cmccabe via yliu)
HDFS-7263. Snapshot read can reveal future bytes for appended files. Contributed by Tao Luo.