Update kafo to 0.6.5

Scratches built in http://ci.theforeman.org/view/Packaging/job/packaging_build_deb_dependency/587/ e.g. http://stagingdeb.theforeman.org/pool/wheezy/ares-nightly/r/ruby-kafo/

I'll do nightly builds after merge.
For future ref, we're no longer building for squeeze.