HDDS-5039. Support command changing the logging level of a server without restarting the server (#2091)

diff --git a/hadoop-ozone/dist/src/shell/ozone/ozone b/hadoop-ozone/dist/src/shell/ozone/ozone
index f5c1423..f1cd3d1 100755
--- a/hadoop-ozone/dist/src/shell/ozone/ozone
+++ b/hadoop-ozone/dist/src/shell/ozone/ozone
@@ -39,6 +39,7 @@
   ozone_add_subcommand "classpath" client "prints the class path needed for running ozone commands"
   ozone_add_subcommand "datanode" daemon "run a HDDS datanode"
   ozone_add_subcommand "envvars" client "display computed Hadoop environment variables"
+  ozone_add_subcommand "daemonlog" admin "get/set the log level for each daemon"
   ozone_add_subcommand "freon" client "runs an ozone data generator"
   ozone_add_subcommand "fs" client "run a filesystem command on Ozone file system. Equivalent to 'hadoop fs'"
   ozone_add_subcommand "genconf" client "generate minimally required ozone configs and output to ozone-site.xml in specified path"
@@ -202,6 +203,10 @@
       OZONE_CLASSNAME=org.apache.hadoop.fs.ozone.OzoneFsShell
       OZONE_RUN_ARTIFACT_NAME="hadoop-ozone-tools"
     ;;
+    daemonlog)
+      OZONE_CLASSNAME=org.apache.hadoop.log.LogLevel
+      OZONE_RUN_ARTIFACT_NAME="hadoop-ozone-tools"
+    ;;
     insight)
       OZONE_CLASSNAME=org.apache.hadoop.ozone.insight.Insight
       OZONE_RUN_ARTIFACT_NAME="hadoop-ozone-insight"