[yocto] yocto_installer test script update

[Ke, Liping]

Hi, Jessica

  I have updated the script file which modifies all your input (prompts and the discussion result in the weekly meeting such as logfile, go on installing when /var/lib/opkg exists, etc).
  I have tested with lianhao's repository (x86_64 native sdk has some problem, he's now fixing it). Sample log files are included. I had uploaded in lianhao's website.


Any problem, just let me know. I can fix it tomorrow!

Thanks & Regards,
criping