KVM: support version reported by 1.0

This of course was working for all the rcs, but broke with 1.0 itself.

In addition:
  - split between running kvm --version and parsing its output
  - unittest parsing for various known --help outputs
  - updated NEWS file
  - happy 2012 wishes
  - the hope to finish this patch before it's time to say happy easter
    :)

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>