Modify `io_test` to adapt to the Chinese environment

[seamile]

When the system environment is Chinese, io_test() will throw an error. Therefore, in io_test(), we need to let awk use both Chinese and English commas as delimiters.

The error like this:

 I/O Speed(1st run) : 1073741824字节（1.1 GB，1.0 GiB）已复制，2.26661 s，474 MB/s
 I/O Speed(2nd run) : 1073741824字节（1.1 GB，1.0 GiB）已复制，2.22526 s，483 MB/s
 I/O Speed(3rd run) : 1073741824字节（1.1 GB，1.0 GiB）已复制，2.02646 s，530 MB/s
awk: 命令行:1: BEGIN{print 1073741824字节（1.1 + 1073741824字节（1.1 + 1073741824字节（1.1}
awk: 命令行:1:                       ^ 表达式中的无效字符“
awk: 命令行:1: BEGIN{print 1073741824字节（1.1 + 1073741824字节（1.1 + 1073741824字节（1.1}
awk: 命令行:1:                       ^ syntax error
awk: 命令行:1: BEGIN{printf "%.1f",  / 3}
awk: 命令行:1:                        ^ 未终止的正则表达式
awk: 命令行:1: BEGIN{printf "%.1f",  / 3}
awk: 命令行:1:                           ^ 未预期的新行或字符串结束
 I/O Speed(average) :  MB/s

[teddysun]

Thanks & Merged