AMBARI-10485. 'yarn.nodemanager.linux-container-executor.group' not having default value in HDP-2.3 stack (srimanth)

ambari-server/src/main/resources/stacks/HDP/2.3/services/YARN/configuration/yarn-site.xml

@@ -49,6 +49,8 @@
   </property>
   <property>
     <name>yarn.nodemanager.linux-container-executor.group</name>
+    <value>hadoop</value>
+    <description>Unix group of the NodeManager</description>
     <depends-on>
       <property>
         <type>yarn-env</type>