HDFS-6878. Change MiniDFSCluster to support StorageType configuration for individual directories. (Arpit Agarwal)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619271 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6758. Block writer should pass the expected block size to DataXceiverServer (Arpit Agarwal)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619275 13f79535-47bb-0310-9956-ffa450edef68