YARN-5800. Delete LinuxContainerExecutor comment from yarn-default.xml (Contributed by Jan Hentschel via Daniel Templeton)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -965,7 +965,6 @@
     <description>who will execute(launch) the containers.</description>
     <name>yarn.nodemanager.container-executor.class</name>
     <value>org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor</value>
-<!--<value>org.apache.hadoop.yarn.server.nodemanager.LinuxContainerExecutor</value>-->
   </property>
 
   <property>