HADOOP-15857. Remove ozonefs class name definition from core-default.xml. Contributed by Elek, Marton.

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

@@ -1769,14 +1769,6 @@
   </description>
 </property>
 
-
-<!-- Ozone file system properties -->
-<property>
-  <name>fs.o3.impl</name>
-  <value>org.apache.hadoop.fs.ozone.OzoneFileSystem</value>
-  <description>The implementation class of the Ozone FileSystem.</description>
-</property>
-
 <property>
   <name>fs.AbstractFileSystem.o3.impl</name>
   <value>org.apache.hadoop.fs.ozone.OzFs</value>