[yocto] yocto_installer test script update

[Ke, Liping]

Hi, Jessica

The newer version of the installer is in lianhao's location. You can directly run ./yocto_installer
http://llu-piketon.sh.intel.com/ Today we tested both on 32 bit and 64 bit ubuntu host.

It's very initial and rough, I will move many non-root required ops into the outer wrapper script later. 

Any early comments are welcomed, just let me know.

Thanks& Regards,
criping