OpenPOWER repo / LE guest support fixes

This adds a repo (yet to be added on our mirrors btw) which includes some specially build binary packages on Fedora ppc64. This is required for Little Endian (LE) guest support. 
So this works for yum, and I'm fine with it being in this recipe, since it is fedora specific, but accepting a comparison operator in the version string is something that is [dependent on the provider implementation](https://github.com/opscode/chef/blob/master/lib/chef/provider/package/yum.rb#L442) and shouldn't be done generally. A more generic way of doing this is:

```ruby
package "kernel" do
  version node['osl-openstack']['openpower']['kernel_version']
  action :upgrade
end
```