fix to support debian as well as ubuntu systems

I looks like your updates to omnibus_updater have lost the patch to allow debian rather that just ubuntu systems to work.

failing path generated by omnibus_updater 
http://opscode-omnitruck-release.s3.amazonaws.com/debian/6/x86_64/chef_10.18.2-2.debian.6_amd64.deb

correct path
http://opscode-omnitruck-release.s3.amazonaws.com/debian/6/x86_64/chef_10.18.2-2.debian.6.0.5_amd64.deb


In recipes/set_remote_path.rb if you replace the debian/ubuntu section with the following it should fix it again.