Merged revision(s) 1609020 from hadoop/common/trunk:
   HDFS-6646. [ HDFS Rolling Upgrade - Shell ] shutdownDatanode and getDatanodeInfo usage is missed ( Contributed by Brahma Reddy Battula)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609021 13f79535-47bb-0310-9956-ffa450edef68