HDFS-6168. Remove a deprecated constructor and the deprecated methods reportChecksumFailure, getDelegationToken(Text), renewDelegationToken and cancelDelegationToken from DistributedFileSystem.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1582856 13f79535-47bb-0310-9956-ffa450edef68