HDFS-12179. Ozone: Corona: Adding corona as part of hdfs command. Contributed by Nandakumar.

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs

@@ -36,6 +36,7 @@ function hadoop_usage
   hadoop_add_subcommand "cblock" "cblock CLI"
   hadoop_add_subcommand "cblockserver" "run cblock server"
   hadoop_add_subcommand "classpath" "prints the class path needed to get the hadoop jar and the required libraries"
+  hadoop_add_subcommand "corona" "run an ozone data generator"
   hadoop_add_subcommand "crypto" "configure HDFS encryption zones"
   hadoop_add_subcommand "datanode" "run a DFS datanode"
   hadoop_add_subcommand "debug" "run a Debug Admin to execute HDFS debug commands"
@@ -102,6 +103,9 @@ function hdfscmd_case
     classpath)
       hadoop_do_classpath_subcommand HADOOP_CLASSNAME "$@"
     ;;
+    corona)
+      HADOOP_CLASSNAME=org.apache.hadoop.ozone.Corona
+    ;;
     crypto)
       HADOOP_CLASSNAME=org.apache.hadoop.hdfs.tools.CryptoAdmin
     ;;