Remove unused imports

h2/src/main/org/h2/mvstore/MVStore.java

@@ -18,16 +18,12 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedList;
-import java.util.List;
 import java.util.Map;
 import java.util.PriorityQueue;
 import java.util.Queue;
 import java.util.Set;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -37,7 +33,6 @@ import org.h2.compress.CompressDeflate;
 import org.h2.compress.CompressLZF;
 import org.h2.compress.Compressor;
 import org.h2.engine.Constants;
-import org.h2.message.DbException;
 import org.h2.mvstore.cache.CacheLongKeyLIRS;
 import org.h2.util.MathUtils;
 import org.h2.util.Utils;