YARN-7782. Enable user re-mapping for Docker containers in yarn-default.xml. Contributed by Eric Yang

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

@@ -1656,7 +1656,7 @@
   <property>
     <description>Property to enable docker user remapping</description>
     <name>yarn.nodemanager.runtime.linux.docker.enable-userremapping.allowed</name>
-    <value>false</value>
+    <value>true</value>
   </property>
 
   <property>