refactoring driver

[miurahr]

driver.rb is now messy.
we can split driver class with sub class such as driver::domain, driver::network etc.
Any suggestions?

[adrahon]

I was thinking the same, but part of the problem is we have both driver.rb and things in util/ like vm_definition.rb. I'm not sure what's the right way to factor that, maybe have a small driver and put stuff from vm_definition.rb in driver::domain?