AMBARI-4593 Remove "yarn.ahs.store.class" config from YARN (Denys Buzhor via ababiichuk)

ambari-server/src/main/resources/stacks/HDP/2.1.1/services/YARN/configuration/yarn-site.xml

@@ -339,12 +339,6 @@
     </description>
   </property>
 
-  <property>
-    <name>yarn.ahs.store.class</name>
-    <value>org.apache.hadoop.yarn.server.applicationhistoryservice.NullApplicationHistoryStore</value>
-    <description></description>
-  </property>
-
   <property>
     <name>yarn.ats.store.class</name>
     <value>org.apache.hadoop.yarn.server.applicationhistoryservice.timeline.LeveldbApplicationTimelineStore</value>