kvm-autotest: a modified step-file format and steps-data image names

Hello,

I've just pushed some new commits of kvm-autotest.

One thing that have changed is the way we name steps-data images (and as a result a minor change to the step files format).

If you have created your own step-files (and have the automatically-generated steps-data images for them), you need to convert them (both step-files and steps-data image names).

Please look at the following link for explanation of why the change is done and for instructions of how to convert your step files.

http://kvm.et.redhat.com/page/KVM-Autotest/Steps
look at "Conversion to the new step file format (April 2009)"

This mainly affects debugging capability upon a steps type test failure.

Thanks,
Uri.