ZOOKEEPER-2904: Remove unused imports from org.apache.zookeeper.server.quorum.WatchLeakTest

Following imports are never used and unused imports do not adhere to code standard :

import org.apache.zookeeper.server.ZooTrace;
import java.util.ArrayList;
import java.util.List;

Author: Nikhil Bhide <nikhilbhide15@gmail.com>

Reviewers: Patrick Hunt <phunt@apache.org>

Closes #387 from nikhilbhide/ZOOKEEPER-2904

Change-Id: Ib1140021d3432c9e7981dfdf48e75ea1a2de325f

src/java/test/org/apache/zookeeper/server/quorum/WatchLeakTest.java

@@ -40,9 +40,7 @@ import java.nio.channels.SelectableChannel;
 import java.nio.channels.SelectionKey;
 import java.nio.channels.Selector;
 import java.nio.channels.SocketChannel;
-import java.util.ArrayList;
 import java.util.Collections;
-import java.util.List;
 import java.util.Random;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -61,7 +59,6 @@ import org.apache.zookeeper.server.NIOServerCnxn;
 import org.apache.zookeeper.server.NIOServerCnxnFactory;
 import org.apache.zookeeper.server.MockSelectorThread;
 import org.apache.zookeeper.server.ZKDatabase;
-import org.apache.zookeeper.server.ZooTrace;
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
 import org.apache.zookeeper.ZKParameterized;
 import org.junit.Before;