HDDS-74. Rename name of properties related to configuration tags.

Contributed by Sandeep Nemuri.

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/conf/HddsConfServlet.java

@@ -154,7 +154,7 @@ public class HddsConfServlet extends HttpServlet {
 
     switch (cmd) {
     case "getOzoneTags":
-      out.write(gson.toJson(config.get("ozone.system.tags").split(",")));
+      out.write(gson.toJson(config.get("ozone.tags.system").split(",")));
       break;
     case "getPropertyByTag":
       String tags = request.getParameter("tags");

hadoop-hdds/common/src/main/resources/ozone-default.xml

@@ -1006,12 +1006,12 @@
   </property>
 
   <property>
-    <name>hadoop.custom.tags</name>
+    <name>hadoop.tags.custom</name>
     <value>OZONE,MANAGEMENT,SECURITY,PERFORMANCE,DEBUG,CLIENT,SERVER,KSM,SCM,CRITICAL,RATIS,CONTAINER,REQUIRED,REST,STORAGE,PIPELINE,STANDALONE</value>
   </property>
 
   <property>
-    <name>ozone.system.tags</name>
+    <name>ozone.tags.system</name>
     <value>OZONE,MANAGEMENT,SECURITY,PERFORMANCE,DEBUG,CLIENT,SERVER,KSM,SCM,CRITICAL,RATIS,CONTAINER,REQUIRED,REST,STORAGE,PIPELINE,STANDALONE</value>
   </property>