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

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));
				}
			}
		}

Start at com.dianping.zebra.shard.jdbc.ShardStatement#executeQueryByOriginal and compare the existing debug logging in the isSingleTarget(routerTarget) branch with the other execution path. The change is complete when routed database names and executable SQL statements are also logged at debug level for non-single targets.