修正connection.id，statement.id, resultSet.id生成不正确的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@227 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/proxy/jdbc/DataSourceProxy.java

@@ -26,7 +26,7 @@ import com.alibaba.druid.filter.Filter;
 public interface DataSourceProxy {
 
     String getName();
-    
+
     String getDbType();
 
     Driver getRawDriver();
@@ -36,4 +36,10 @@ public interface DataSourceProxy {
     String getRawJdbcUrl();
 
     List<Filter> getFilters();
+
+    long createConnectionId();
+
+    long createStatementId();
+
+    long createResultSetId();
 }