[Linaro-validation] versiontools patch

Zygmunt here's a patch to support a "managed" version for your versiontools. I fear you are going to want it more integrated into your current classes, but as I looked at it - it seemed it would required me making more changes to the classes than I felt comfortable with (or have time to make). Would you merge this, or should we just try and do something like this some other day when we have more time to do it better?

-andy