Fix PMD violations

java/src/main/java/org/rocksdb/DBOptionsInterface.java

@@ -1786,5 +1786,5 @@ public interface DBOptionsInterface<T extends DBOptionsInterface<T>> {
    *
    * @return String value of current offpeak time range, "" if none is set.
    */
-  public String dailyOffpeakTimeUTC();
+  String dailyOffpeakTimeUTC();
 }

java/src/main/java/org/rocksdb/MutableDBOptionsInterface.java

@@ -1,8 +1,6 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 package org.rocksdb;
 
-import java.time.LocalTime;
-
 public interface MutableDBOptionsInterface<T extends MutableDBOptionsInterface<T>> {
   /**
    * Specifies the maximum number of concurrent background jobs (both flushes