修正连接池不能正确被回收的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@538 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/test/java/com/alibaba/druid/bvt/pool/TestIdle.java

@@ -59,7 +59,7 @@ public class TestIdle extends TestCase {
 
         Thread.sleep(dataSource.getMinEvictableIdleTimeMillis() * 2);
         Assert.assertEquals(0, driver.getConnections().size());
-        Assert.assertEquals(0, dataSource.getPoolingCount());
+        Assert.assertEquals(1, dataSource.getPoolingCount());
         {
             Connection conn = dataSource.getConnection();
             Assert.assertEquals(dataSource.getMinIdle(), driver.getConnections().size());