Incorporating code review feedback for finalizeWrite for COW

hoodie-client/src/main/java/com/uber/hoodie/table/HoodieMergeOnReadTable.java

@@ -250,9 +250,19 @@ public class HoodieMergeOnReadTable<T extends HoodieRecordPayload> extends
     return allRollbackStats;
   }
 
+  @Override
+  public void initializeFinalizeWrite() {
+    // do nothing for MOR tables
+  }
+
   @Override
   public Optional<Integer> finalizeWrite(JavaSparkContext jsc, List writeStatuses) {
     // do nothing for MOR tables
     return Optional.empty();
   }
+
+  @Override
+  public void cleanTemporaryDataFiles(JavaSparkContext jsc) {
+    // do nothing for MOR tables
+  }
 }