AMBARI-5435. Add option to disable App Timeline Server logging. (yusaku)

ambari-server/src/main/resources/stacks/HDP/2.1/services/YARN/configuration/yarn-site.xml

@@ -339,6 +339,14 @@
     </description>
   </property>
 
+  <property>
+    <name>yarn.timeline-service.enabled</name>
+    <value>true</value>
+    <description>Indicate to clients whether timeline service is enabled or not.
+      If enabled, clients will put entities and events to the timeline server.
+    </description>
+  </property>
+
   <property>
     <name>yarn.timeline-service.store-class</name>
     <value>org.apache.hadoop.yarn.server.applicationhistoryservice.timeline.LeveldbTimelineStore</value>

ambari-web/app/data/HDP2/site_properties.js

@@ -243,6 +243,14 @@ module.exports =
       "category": "Advanced",
       "serviceName": "YARN"
     },
+    {
+      "id": "site property",
+      "name": "yarn.timeline-service.enabled",
+      "displayName": "yarn.timeline-service.enabled",
+      "category": "AppTimelineServer",
+      "displayType": "checkbox",
+      "serviceName": "YARN"
+    },
     {
       "id": "site property",
       "name": "yarn.timeline-service.leveldb-timeline-store.path",