分库分表时RouterResult不是SingleTarget的情况下希望也打印路由出来的db和sql debug日志，方便调试

[tensorZhang]

com.dianping.zebra.shard.jdbc.ShardStatement#executeQueryByOriginal
此方法中isSingleTarget(routerTarget)情况下打印了db，sql日志；希望else情况下也将db、sql日志打印出来。谢谢！

if (LOGGER.isDebugEnabled()) {
						LOGGER.debug("db:" + targetedSql.getDatabaseName());
						LOGGER.debug("sql:" + executableSql);
					}

if (isSingleTarget(routerTarget)) {
			// if has only one sql,then serial execute it
			for (RouterTarget targetedSql : routerTarget.getSqls()) {
				for (String executableSql : targetedSql.getSqls()) {
					if (LOGGER.isDebugEnabled()) {
						LOGGER.debug("db:" + targetedSql.getDatabaseName());
						LOGGER.debug("sql:" + executableSql);
					}

					Connection conn = connection.getRealConnection(targetedSql.getDatabaseName(), autoCommit);
					Statement stmt = createStatement(conn);
					actualStatements.add(stmt);

					resultList.add(stmt.executeQuery(executableSql));
				}
			}
		}