[MINOR] Remove unused log code in HoodieReadClient (#2000)

diff --git a/hudi-client/src/main/java/org/apache/hudi/client/HoodieReadClient.java b/hudi-client/src/main/java/org/apache/hudi/client/HoodieReadClient.java
index d4249af..1a00197 100644
--- a/hudi-client/src/main/java/org/apache/hudi/client/HoodieReadClient.java
+++ b/hudi-client/src/main/java/org/apache/hudi/client/HoodieReadClient.java
@@ -34,8 +34,6 @@
 import org.apache.hudi.index.HoodieIndex;
 import org.apache.hudi.table.HoodieTable;
 
-import org.apache.log4j.LogManager;
-import org.apache.log4j.Logger;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaPairRDD;
 import org.apache.spark.api.java.JavaRDD;
@@ -59,7 +57,6 @@
 public class HoodieReadClient<T extends HoodieRecordPayload> implements Serializable {
 
   private static final long serialVersionUID = 1L;
-  private static final Logger LOG = LogManager.getLogger(HoodieReadClient.class);
 
   /**
    * TODO: We need to persist the index type into hoodie.properties and be able to access the index just with a simple