Code review comment for lp://qastaging/~jordanrinke/nova/hypervupdate

Vish: I didn't specifically change the files on purpose that I remember, I think it has something to do with the dual windows/linux vm environment I use for development with a dual mounted ntfs share. Let me see if I can get that corrected somehow.

Soren: That comment was because I lifted those cache/fetch functions from the libvirt code that vish wrote so if anyone else tries to tinker with it there is a level of familiarity.

I will fix/push shortly.