Removed unused imports

Author: merlimat

pulsar-transaction/coordinator/src/main/java/org/apache/pulsar/transaction/coordinator/impl/TxnLogBufferedWriter.java

@@ -26,17 +26,14 @@
 import io.netty.util.Timer;
 import io.netty.util.TimerTask;
 import java.util.ArrayList;
-import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
 import lombok.Getter;
 import lombok.ToString;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.bookkeeper.common.util.OrderedExecutor;
 import org.apache.bookkeeper.mledger.AsyncCallbacks;
 import org.apache.bookkeeper.mledger.ManagedLedger;
 import org.apache.bookkeeper.mledger.ManagedLedgerException;