Two major changes here:
Two major changes here:

1. work with the new portage build system. Yes, cross compiling works.

2. work with new upstream changes to build a single or a subset of site test which specified from command line.

I will update the how-to document after all code checked in.

Please also refer to change from 582012 which had been included here and 582012 will be abandoned after this CL checked in.

Review URL: http://codereview.chromium.org/596110

mischief/scripts,smilart/scripts,gtank/scripts,BugRoger/scripts,andrejro/coreos--scripts,crawford/scripts,smilart/scripts,coreos/scripts,sigma/coreos-scripts,marineam/coreos-scripts,andrejro/coreos--scripts,fivethreeo/scripts,trnubo/scripts,gtank/scripts,sigma/coreos-scripts,smilart/scripts,nicescale/scripts,bcwaldon/coreos-scripts,mjg59/scripts,mjg59/scripts,nicescale/scripts,andrejro/coreos--scripts,mjg59/scripts,gtank/scripts,mischief/scripts,glevand/coreos--scripts,crawford/scripts,vmware/coreos-scripts,zhang0137/scripts,endocode/scripts,endocode/scripts,bcwaldon/coreos-scripts,glevand/coreos--scripts,BugRoger/scripts,marineam/coreos-scripts,sigma/coreos-scripts,marineam/coreos-scripts,vmware/coreos-scripts,mischief/scripts,crawford/scripts,zhang0137/scripts,vmware/coreos-scripts,fivethreeo/scripts,nicescale/scripts,BugRoger/scripts,trnubo/scripts,coreos/scripts,zhang0137/scripts,bcwaldon/coreos-scripts,fivethreeo/scripts,endocode/scripts,trnubo/scripts