MVCC: the probability of lock timeouts is now lower if multiple threads try to…

MVCC: the probability of lock timeouts is now lower if multiple threads try to update the same rows.

h2/src/test/org/h2/test/mvcc/TestMvccMultiThreaded.java

@@ -39,7 +39,7 @@ public class TestMvccMultiThreaded extends TestBase {
         int len = 3;
         final Connection[] connList = new Connection[len];
         for (int i = 0; i < len; i++) {
-            Connection conn = getConnection("mvccMultiThreaded;MVCC=TRUE;LOCK_TIMEOUT=100");
+            Connection conn = getConnection("mvccMultiThreaded;MVCC=TRUE;LOCK_TIMEOUT=500");
             connList[i] = conn;
         }
         Connection conn = connList[0];