把testOnBorrow的实现移到Lock之外实现

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@209 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java

@@ -635,7 +635,7 @@ public abstract class DruidAbstractDataSource implements DataSource, DataSourceP
         }
     }
 
-    public void validateConnection(Connection conn) throws SQLException {
+    protected void validateConnection(Connection conn) throws SQLException {
         String query = getValidationQuery();
         if (conn.isClosed()) {
             throw new SQLException("validateConnection: connection closed");